JP4137429B2 - Recording / reproducing apparatus, recording / reproducing method, program, and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording / reproducing apparatus, a recording / reproducing method, a medium, and a program for recording AV data.
[0002]
[Prior art]
In recent years, with the spread and progress of personal computers, many recording and reproducing devices such as hard disk drives and magneto-optical disk drives have come to be used as external storage devices due to their large capacity and high speed. Along with the enlargement of computer software and the increase in the volume of data to be handled, these recording and playback devices as external storage devices have been realized at higher speeds and larger capacities.
[0003]
The recording / reproducing apparatus that has dealt with computer data in this way makes use of its high speed and large capacity, and can also be used as a digital AV device for recording and reproducing video / audio data (hereinafter referred to as AV data) by applying digital technology. It is getting used.
[0004]
When recording computer data or a program in a recording / reproducing apparatus, if an error occurs even in one bit, a serious problem such as a malfunction of the program occurs. Therefore, the recording / reproducing apparatus performs a strict error check when recording and reproducing computer data to guarantee the reliability of data and programs.
[0005]
For such error checking, a reassignment process for reassigning LBA (Logical Block Address) to a sector of a recording medium, a retry process for re-recording or reading a sector in which an error has occurred, or an assignment to an errored sector There is a replacement process in which the LBA that has been assigned is assigned to another sector in the replacement area, and the use of the sector in which the error has occurred is stopped.
[0006]
On the other hand, when recording AV data in a recording / reproducing apparatus, it is important to guarantee the continuity of the AV data by recording and reproducing the AV data so that the AV data is not interrupted, rather than the reliability of the data.
[0007]
In other words, when reproducing AV data, if an error occurs in one byte of data, when the AV data is displayed on a television monitor, there is only an effect that the viewer hardly notices.
[0008]
However, if a strict error check such as retry processing or replacement processing is executed during AV data playback, the AV data playback is interrupted due to the error check, and the video displayed on the TV monitor is interrupted. It will be very annoying for viewers.
[0009]
FIG. 13 shows a recording / reproducing apparatus 40 for recording and reproducing the proposed continuity of AV data.
[0010]
The recording / reproducing apparatus 40 includes an HDD 41, an AV recording / reproducing HDD controller 43, a replacement DAU table 42, a file system 4, a recording buffer 8, and a reproducing buffer 9.
[0011]
FIG. 14 shows a magnetic disk medium 44 on which the HDD 41 writes and reads AV data.
[0012]
The magnetic disk medium 44 is provided with an AV data recording area 47 and a replacement DAU area 46. That is, the AV data recording area 47 is an area in which AV data is written in units of disk access units, which is the minimum unit for continuously accessing the magnetic disk medium 44, and the replacement DAU area 46 is the disk access of the AV data recording area 47. This is an area in which a disk access unit for writing AV data as a substitute for the disk access unit when the unit cannot be written normally due to a defect in the unit is secured in advance. As described above, the recording / reproducing apparatus 40 performs a replacement process of a disk access unit that writes AV data to a disk access unit secured in the replacement DAU area 46 as a substitute for the disk access unit in the AV data recording area 47.
[0013]
Further, when the size of the disk access unit is reduced, the HDD 41 seeks frequently and waits for rotation, so the AV data transfer rate decreases. Accordingly, the size of the disk access unit is large enough to guarantee continuous transfer of AV data, for example, 2 Mbytes.
[0014]
As shown in FIG. 17, the HDD 41 stores a table associating the notified LBA (Logical Block Address) with a track number and a sector number representing the physical position of the magnetic disk medium 44. The AV data is written or read by specifying the physical location of the magnetic disk medium 44.
[0015]
The AV recording / reproducing HDD controller 43 is means for controlling the HDD 41. The replacement DAU table 42 is a table for knowing the number of the disk access unit after the replacement process from the number of the disk access unit before the replacement process.
[0016]
FIG. 15 shows an example of the replacement DAU table 42. The DAU number 51 is the number of the disk access unit before the replacement process, and the DAU number 52 after the replacement process is the number of the disk access unit after the replacement process. However, when the replacement process is not performed, the same number as the DAU number 51 is stored in the DAU number 52 after the replacement process.
[0017]
The file system 4 is for handling AV data as a file, stores file information including information on disk access units constituting the file, refers to file information by specifying a file name, A means for updating file information.
[0018]
The file system 4 stores a DAU conversion table 53 shown in FIG. The DAU conversion table 53 is a table for converting the disk access unit number 54 assigned to identify the disk access unit into the head LBA 55 of the disk access unit of the magnetic disk medium 44.
[0019]
The recording buffer 8 is a buffer for temporarily storing AV data to be written to the magnetic disk medium 44 when the AV data is transferred.
[0020]
  Playback buffer9Is a buffer for temporarily storing AV data read from the magnetic disk medium 44.
[0021]
Next, the operation of such a recording / reproducing apparatus 40 will be described.
[0022]
First, the recording / reproducing apparatus 40 performs format processing of the magnetic disk medium 44 before recording or reproducing AV data on the magnetic disk medium 44. When this formatting process is performed, a replacement DAU area 46 is secured separately from the AV data recording area 47.
[0023]
Next, in order to guarantee that the AV data is transferred in real time, the disk access unit in the replacement DAU area 46 is used without using a disk access unit that is defective or takes a predetermined time or more for writing or reading. Perform replacement processing to replace.
[0024]
That is, the AV recording / reproducing controller 43 performs a writing process and a reading process on the disk access unit of the disk medium 44, thereby causing a disk access that has a defect or takes a predetermined time or more for writing or reading. Find the unit.
[0025]
When the AV recording / reproducing controller 43 finds such a disk access unit, it notifies the file system 4.
[0026]
When notified, the file system 4 rewrites the replacement DAU table 42. In other words, the DAU number 52 after the replacement process corresponding to the notified disk access unit number is rewritten to the disk access unit number in the replacement DAU area 46.
[0027]
The above processing is repeated for all the disk access units of the magnetic disk medium 44.
[0028]
When the sector-by-sector replacement process is performed, a seek operation and a rotation wait are generated in the sector for which the replacement process has been performed, so that extra time is required for writing and reading. Therefore, if replacement processing occurs at intervals smaller than the size that can guarantee that AV data is continuously transferred, continuous transfer of AV data cannot be guaranteed due to seeking or waiting for rotation. However, since the recording / reproducing apparatus 40 performs replacement processing not in units of sectors but in units of disk access units having a size that guarantees continuous transfer of AV data, even if the replacement processing is performed, the continuity of AV data is increased. Can be guaranteed.
[0029]
In this way, the recording / reproducing apparatus 40 ensures that AV data is transferred in real time by performing a replacement process in units of disk access units in advance.
[0030]
Next, a case where AV data is recorded on the magnetic disk medium 44 will be described.
[0031]
AV data received by a TV tuner or the like is transferred to the recording / reproducing apparatus 40 in real time.
[0032]
The recording buffer 8 temporarily records the AV data transferred in real time as described above.
[0033]
When the recording buffer 8 stores AV data for the disk access unit, it notifies the AV recording / reproducing HDD controller 43 of the AV data.
[0034]
When notified from the recording buffer 8 that AV data for the disk access unit has been stored, the AV recording / playback HDD controller 43 requests the file system 4 to notify the disk access unit to which the AV data is to be written. .
[0035]
In response to this, the file system 4 checks the number of the disk access unit to which AV data is to be written from the file information, and changes the disk access unit number 51 to the DAU number 52 after the replacement process by the replacement DAU table 42 shown in FIG. Convert. When the disk access unit to which AV data is to be written is replaced due to a defect or the like, the number of the disk access unit in the replacement DAU area 46 is written in the DAU number 52 after the replacement process. When the replacement process is not performed, the same number as the disk access unit number to which AV data is to be written is described in the DAU number 52 after the replacement process. Then, the converted disk access unit number is notified to the AV recording / reproducing HDD controller 43. Accordingly, among the disk access units in the AV data recording area 47, a disk access unit that is defective or takes a predetermined time or more for writing or reading is not used.
[0036]
When notified from the file system 4 of the disk access unit number to which AV data is to be written, the AV recording / playback HDD controller 43 further requests to notify the head LBA of the notified disk access unit number.
[0037]
When the file system 4 receives the request from the AV recording / playback HDD controller 43, the file system 4 obtains the head LBA of the disk access unit by using the DAU conversion table 53 shown in FIG. Then, the AV recording / reproducing HDD controller 43 is notified.
[0038]
The AV recording / reproducing HDD controller 43 requests the recording buffer 8 to transfer AV data to be written in one disk access unit.
[0039]
In response to this, the recording buffer 8 transfers the AV data to be written in one disk access unit to the AV recording / reproducing HDD controller 43.
[0040]
The AV recording / playback HDD controller 43 designates the number of sectors to which AV data should be written from the notified LBA, issues a write command to the file system 4, and transfers the AV data transferred from the recording buffer 8 to the HDD 41. To do.
[0041]
  The file system 4 is a write command sent from the AV recording / reproducing HDD controller 43.DoSend to HDD41.
[0042]
The HDD 41 converts the notified LBA into a track number and a sector number according to the table of FIG. 17, and writes the transferred AV data to the sector constituting the corresponding track of the magnetic disk medium 44.
[0043]
On the other hand, AV data has been transferred to the recording buffer 8 in real time. When the recording buffer 8 stores AV data for the disk access unit again, it notifies the AV recording / reproducing HDD controller 43 of the AV data. Thereafter, the AV data transferred in real time is recorded by repeating the same operation as described above. In this way, since a disk access unit that does not complete recording of AV data even if a predetermined time or more has elapsed due to a defect or the like is used, real-time transfer of AV data can be guaranteed. .
[0044]
Next, a case where AV data is read from the magnetic disk medium 44 will be described.
[0045]
The playback buffer 9 outputs the AV data in real time, and notifies the AV recording / playback HDD controller 43 when there is a free space for the disk access unit.
[0046]
Upon receiving the notification from the reproduction buffer 9, the AV recording / reproducing HDD controller 43 requests the number of the disk access unit to be read next from the file system 4.
[0047]
In response to this, the file system 4 checks the number of the disk access unit to which AV data is to be written from the file information, and changes the disk access unit number 51 to the DAU number 52 after the replacement process by the replacement DAU table 42 shown in FIG. Convert. Therefore, a defective disk access unit is not used. Then, the converted disk access unit number is notified to the AV recording / reproducing HDD controller 43.
[0048]
When the file system 4 is notified of the number of the disk access unit to which AV data is to be written, the AV recording / reproducing HDD controller 43 inquires of the file system 4 about the head LBA of the notified disk access unit.
[0049]
Upon receiving an inquiry from the AV recording / reproducing HDD controller 43, the file system 4 notifies the AV recording / reproducing controller 43 of the head LBA of the disk access unit.
[0050]
When receiving the LBA notified from the file system 4, the AV recording / reproducing HDD controller 43 issues a read command to the file system 4 by designating the LBA and the number of sectors from which AV data should be read.
[0051]
The file system 4 relays the read command sent from the AV recording / reproducing HDD controller 43 to the HDD 41.
[0052]
The HDD 41 converts the notified LBA into a track number and a sector number according to the table of FIG. 17, reads AV data from the sector constituting the corresponding track of the magnetic disk medium 44, and transfers it to the AV recording / reproducing HDD controller 43. To do.
[0053]
The AV recording / reproducing HDD controller 43 transfers the read AV data to the reproduction buffer 9.
[0054]
The playback buffer 9 stores the AV data read by the AV recording / playback HDD controller 43 and outputs the stored AV data in real time.
[0055]
Therefore, the recording / reproducing apparatus 40 sets the size of the disk access unit to a size large enough to continuously transfer AV data, and uses the disk access unit in the replacement DAU area 46 instead of the defective disk access unit. , Continuous transfer of AV data can be guaranteed.
[0056]
[Problems to be solved by the invention]
However, since the conventional recording / reproducing apparatus 40 needs to perform replacement processing of the disk access unit in advance in order to guarantee continuous transfer of AV data without interruption, it takes time and effort.
[0057]
That is, in order to continuously transfer AV data without interruption, there is a problem (first problem) that it is necessary to perform a disk access unit replacement process, which takes time and effort.
[0058]
Further, when performing the replacement process, the reading process and the writing process are performed over the entire magnetic disk medium 44 in order to find a defect in the disk access unit and a disk access unit that takes a predetermined time or longer for reading or writing. The AV data already recorded on the magnetic disk medium 44 is erased.
[0059]
That is, when the replacement process of the disk access unit is performed to ensure that AV data is continuously transferred without interruption, the AV data previously recorded on the recording medium is erased (second problem) )
[0060]
In addition, in order to perform the disk access unit replacement process, an alternative disk access unit such as the replacement DAU area 46 needs to be secured in the magnetic disk medium 44. For this reason, areas where the user can freely record AV data such as the AV data recording area 47 are reduced.
[0061]
That is, when the replacement process of the disk access unit is performed in order to ensure that AV data is continuously transferred without interruption, an alternative disk access unit must be secured in advance, so that the replacement process is not performed. In comparison, there is a problem (third problem) that the area of the user of the recording medium can be freely used.
[0062]
In addition, when there is a disturbance such as vibration, it is determined that the disk access unit is defective even if the disk access unit of the magnetic disk medium 44 is not defective. Thereafter, it is treated as a defective disk access unit until it is reformatted.
[0063]
In other words, when there is a disturbance such as vibration, even a disk access unit without a defect is determined to be a defective disk access unit, and is subsequently treated as a defective disk access unit until the recording medium is formatted. There is a problem (fourth problem).
[0064]
  In consideration of the first problem, the present invention provides a recording / reproducing apparatus and a recording / reproducing method capable of continuously transferring AV data without interruption without taking time and effort.,ProgramAnd recording mediumIs intended to provide.
[0065]
  In addition, in consideration of the second problem, the present invention provides a recording / reproducing apparatus and a recording / reproducing method capable of continuously transferring AV data without interruption without erasing the AV data already recorded on the recording medium.,ProgramAnd recording mediumIs intended to provide.
[0066]
  In addition, the present invention takes into consideration the above-mentioned third problem, and a recording / reproducing apparatus and a recording / reproducing method capable of continuously transferring AV data without interruption without reducing the area that the user can freely use.,ProgramAnd recording mediumIs intended to provide.
[0067]
  In addition, in consideration of the fourth problem, the present invention does not permanently treat a defect-free disk access unit as a defective disk access unit due to a disturbance such as vibration, and recycles a defect-free disk access unit. Recording / reproducing apparatus and recording / reproducing method that can be used,ProgramAnd recording mediumIs intended to provide.
[0068]
[Means for Solving the Problems]
  In order to solve the above-described problem, the first aspect of the present invention (corresponding to claim 1) includes a recording means capable of writing and reading AV data on a recording medium,
  For the disk access unit, which is the smallest unit that continuously accesses the recording medium,When simultaneous recording / reproduction of AV data is performed, even if the time over time determined to ensure the continuity of AV data to be recorded and reproduced has elapsed, the writing of the AV data to the disk access unit, or An error determination means for determining that an AV data writing or reading error has occurred when reading is not completed;
Based on the determination, if an AV data write or read error occurs in the disk access unit, the write or read error occurs without providing a replacement disk access unit.Disc access knit,Recording control means for controlling the recording means to write or read the AV data to a disk access unit to be written or read;
A skip counter that counts the number of errors that occurred when the AV data was written or read from the disk access unit;
The recording control means has the number of times 1 When a predetermined value that is the above value is exceeded, writing or reading of the disk access unit is prohibited, and control is performed so that it is not used thereafter.A recording / reproducing apparatus.
[0071]
  The second2The present invention (claims)2The error determination means determines that the write error or the read error has occurred when a command error occurs.1The recording / reproducing apparatus according to the present invention.
[0073]
  The second3The present invention (claims)3In the case where writing or reading of the AV data to the disk access unit is not completed even after the time-over time has elapsed, the recording control means forcibly terminates the command issued to the recording means. The disk access unit is controlled to be skipped.1The recording / reproducing apparatus according to the present invention.
[0075]
  The second4The present invention (claims)4The write skip counter counts the number of times that the recording medium is not initialized unless the recording medium is formatted.1The recording / reproducing apparatus according to the present invention.
[0076]
  The second5The present invention (claims)5Is provided with a read prohibition flag indicating whether to prohibit reading of the disk access unit,
  When the read prohibition flag corresponding to the disk access unit is turned on, the recording control means does not read the disk access unit,
  In the recording / reproducing apparatus according to the first aspect of the present invention, when the read prohibition flag corresponding to the disk access unit is off, the disk access unit is controlled to read.
[0077]
  The second6The present invention (claims)6The recording control means turns on the read prohibition flag corresponding to the disk access unit when the write error occurs when writing the AV data to the disk access unit. First5The recording / reproducing apparatus according to the present invention.
[0079]
  The second7The present invention (claims)7The recording control means turns off the read prohibition flag corresponding to the disk access unit when the AV data has been normally written to the disk access unit,
  The read skip counter value corresponding to the disk access unit is initialized to zero.6The recording / reproducing apparatus according to the present invention.
[0080]
  The second8The present invention (claims)8The recording control means turns off the read prohibition flag corresponding to the disk access unit when the AV data recorded in the disk access unit is erased,
  A value of the read skip counter corresponding to the disk access unit is initialized.6The recording / reproducing apparatus according to the present invention.
[0081]
  The second9The present invention (claims)9Corresponds to)A recording buffer for temporarily storing the AV data when the AV data is written;
A playback buffer for temporarily storing the AV data when the AV data is read;
The time-over time includes at least the storage time of the AV data in the recording buffer, the output time of the AV data from the reproduction buffer, the time required for reading the disk access unit, and the writing of the disk access unit. It is the recording / reproducing apparatus of 1st this invention calculated based on required time.
[0082]
  The second10The present invention (claims)10Corresponds to)A recording step capable of writing and reading AV data to and from a recording medium;
Time determined to guarantee both continuity of AV data to be recorded and reproduced when simultaneous recording and reproduction of AV data is performed with respect to a disk access unit which is a minimum unit for continuously accessing the recording medium. An error determination step for determining that an AV data write or read error has occurred when writing or reading of the AV data to the disk access unit is not completed even if an overtime has elapsed;
Based on the determination, if an AV data write or read error occurs in the disk access unit, the disk access unit in which the write or read error occurred is skipped without providing a replacement disk access unit. A recording control step for controlling the recording means to write or read the AV data to a disk access unit to be written or read next;
A skip counter step of counting the number of errors that occurred when the AV data was written or read from the disk access unit,
In the recording control step, the number of times is 1 When a predetermined value which is the above value is exceeded, writing / reading of the disk access unit is prohibited, and the recording / reproducing method is controlled so as not to be used thereafter.
[0084]
  The second11The present invention (claims)11The error determining step determines that the write error or the read error has occurred when a command error occurs.10The recording / reproducing method of the present invention.
[0086]
  The second12The present invention (claims)12Corresponds to)A recording means capable of writing and reading AV data with respect to a recording medium in the recording / reproducing apparatus of the first invention;
Time determined to guarantee both continuity of AV data to be recorded and reproduced when simultaneous recording and reproduction of AV data is performed with respect to a disk access unit which is a minimum unit for continuously accessing the recording medium. An error judging means for judging that an AV data writing or reading error has occurred when the writing or reading of the AV data is not completed in the disk access unit even if the over time has elapsed;
Based on the determination, if an AV data write or read error occurs in the disk access unit, the disk access unit in which the write or read error occurred is skipped without providing a replacement disk access unit. Recording control means for controlling the recording means to write or read the AV data to a disk access unit to be written or read next;
This is a program for causing a computer to function as a skip counter that counts the number of errors that occur when the AV data is written or read from the disk access unit.
[0087]
  The second13The present invention (claims)13Corresponds to)A recording medium on which a program according to the twelfth aspect of the present invention is recorded, and is a recording medium that can be processed by a computer.
[0088]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0089]
(First embodiment)
First, the first embodiment will be described.
[0090]
FIG. 1 shows a recording / reproducing apparatus 1 of the present embodiment.
[0091]
The recording / reproducing apparatus 1 includes an HDD 2, an AV recording / reproducing HDD controller 3, a file system 4, a Skip process determining unit 5, an error monitoring unit 6, a timer 7, a recording buffer 8, and a reproducing buffer 9.
[0092]
As shown in FIG. 17, the HDD 2 stores a table for associating the notified LBA (Logical Block Address) with a track number and a sector number representing the physical position of the magnetic disk medium, as in the prior art. The table is used to write or read AV data on the magnetic disk medium by associating the LBA with the track number and sector number of the magnetic disk medium using this table.
[0093]
FIG. 5 shows a magnetic disk medium 20 on which the HDD 2 writes or reads AV data. Unlike the magnetic disk medium 44 described in the prior art, the magnetic disk medium 20 is not provided with a replacement DAU area 46.
[0094]
The AV recording / reproducing HDD controller 3 is means for controlling the HDD 2.
[0095]
The file system 4 is a DAU conversion table that obtains the head LBA of a disk access unit from file information that is information about a file recorded in the HDD 2, information on each disk access unit of the magnetic disk medium 20, and the number of the disk access unit. Is a means for managing files and disk access units.
[0096]
Here, the file information is information indicating in what order the AV data is written in which disk access unit from the file name. For example, the file name corresponds to the number of the disk access unit constituting the file. In addition, it is information that can list the disk access unit numbers in the order in which AV data is written.
[0097]
The information of each disk access unit of the magnetic disk medium 20 is a write skip counter that counts the number of times that the disk access unit is skipped for writing for each disk access unit, and the disk access unit is skipped for reading. There are a read skip counter for counting the number of times, a defective DAU flag indicating that AV data is not read from the disk access unit at the time of reading, and the like.
[0098]
FIG. 16 shows the DAU conversion table 53. The DAU conversion table 53 is a table for converting the disk access unit number 54 assigned to identify the disk access unit into the head LBA 55 of the disk access unit of the magnetic disk medium 44.
[0099]
The Skip process determination means 5 is a means for determining whether or not to skip the disk access unit when writing or reading.
[0100]
The error monitoring unit 6 is a unit that monitors whether a write error or a read error has occurred while performing a write or read process on the disk access unit.
[0101]
The timer 7 is means for measuring the time during which writing or reading processing is performed on the disk access unit.
[0102]
The recording buffer 8 is a buffer for temporarily storing AV data to be written to the HDD 2 when the AV data is transferred.
[0103]
The reproduction buffer 9 is a buffer for temporarily storing AV data read from the HDD 2.
[0104]
The HDD 2 of the present embodiment is an example of the recording means of the present invention, the magnetic disk medium 20 of the present embodiment is an example of the recording medium of the present invention, and the AV recording / reproducing HDD controller of the present embodiment. 3. The Skip process determining means 5 is an example of the recording control means of the present invention, the error monitoring means 6 of the present embodiment is an example of the error monitoring means of the present invention, and the defective DAU flag of the present embodiment is It is an example of the reading prohibition flag of the invention, and the error monitoring means 6 of the present embodiment is an example of the reading error monitoring means of the invention.
[0105]
Next, the operation of the recording / reproducing apparatus 1 will be described.
First, the operation for recording AV data on the magnetic disk medium 20 of the HDD 2 will be described.
[0106]
At the time when the magnetic disk medium 20 is formatted, both the write skip counter and the read skip counter of each disk access unit described above are initialized to 0, and the defective DAU flag is set to OFF. Here, when the bad DAU flag is off, it indicates that AV data is read from the disk access unit, and when the bad DAU flag is on, it indicates that AV data is not read from the disk access unit. .
[0107]
File information used by the file system 4 to manage files, information on disk access units, and the DAU conversion table 53 are stored in the magnetic disk medium 20. When the recording / reproducing apparatus 1 is activated, the file system 4 loads file information, disk access unit information, and the DAU conversion table 53 from the magnetic disk medium 20 onto the memory of the file system 4.
[0108]
AV data received by a TV tuner or the like is transferred to the recording / reproducing apparatus 1 in real time.
[0109]
The recording buffer 8 temporarily stores the AV data thus transferred in real time. When the AV data for the disk access unit is stored, the AV recording / reproducing HDD controller 3 is notified that the AV data for the disk access unit has been stored.
[0110]
When notified by the recording buffer 8 that AV data for the disk access unit has been stored, the AV recording / reproducing HDD controller 3 requests the file system 4 to notify the disk access unit to which the AV data is to be written. .
[0111]
In response to this, the file system 4 notifies the AV recording / reproducing HDD controller 3 of the number of the disk access unit to which AV data should be written from the file information.
[0112]
When the number of the disk access unit to which AV data is to be written is notified from the file system 4, the AV recording / reproducing HDD controller 3 inquires the file system 4 about the first LBA of the notified number of the disk access unit.
[0113]
When the file system 4 receives the inquiry from the AV recording / reproducing HDD controller 3, the DAU conversion table 53 shown in FIG. 16 obtains the head LBA of the disk access unit as indicated by the head LBA 55 of the disk access unit number. This is notified to the AV recording / reproducing HDD controller 3.
[0114]
The AV recording / reproducing HDD controller 3 requests the recording buffer 8 to transfer AV data to be written in one disk access unit.
[0115]
In response to this, the recording buffer 8 transfers AV data to be written in one disk access unit to the AV recording / reproducing HDD controller 3.
[0116]
The AV recording / playback HDD controller 3 transfers the AV data transferred from the recording buffer 8 to the HDD 2 and writes the head LBA 55 of the disk access unit and the write size which is the size of one disk access unit. A command is issued to the file system 4. The file system 4 relays the write command sent from the AV recording / reproducing HDD controller 3 to the HDD 2.
[0117]
The HDD 2 converts the notified LBA into a track number and a sector number according to the table of FIG. 17 and writes the transferred AV data in the corresponding sector of the magnetic disk medium 44.
[0118]
On the other hand, AV data has been transferred to the recording buffer 8 in real time, and when the recording buffer 8 stores AV data for the disk access unit again, it notifies the AV recording / reproducing HDD controller 3. The recording / reproducing apparatus 1 repeats the same operation as described above and records AV data transferred in real time one after another for each disk access unit.
[0119]
When recording AV data in this way, the error monitoring means 6 monitors whether the write command issued by the AV recording / reproducing HDD controller 3 has been executed normally or whether an error has occurred, thereby causing a bad disk access. Detect unit.
[0120]
FIG. 7 shows the operation of the error monitoring means 6. Hereinafter, the operation of the error monitoring means 6 will be described with reference to FIG.
[0121]
When the AV recording / reproducing HDD controller 3 issues a write command as described above (S1), the error monitoring means 6 enters an error monitoring operation. In other words, the timer 7 is used to measure the time elapsed since the AV recording / reproducing HDD controller 3 issued the write command.
[0122]
Then, the error monitoring means 6 determines whether or not a write command end notification has been sent from the HDD 2 (S2). If a write command end notification has not yet been sent from the HDD 2, the process proceeds to S4. If a write command end notification has been sent from the HDD 2, the process proceeds to S3.
[0123]
In S4, the error monitoring unit 6 determines whether or not the elapsed time after the write command is issued is 300 milliseconds or more. This 300 millisecond time is the time over time derived from the continuity of the AV data. That is, if the writing process to one disk access unit is completed within 300 milliseconds, the continuity of AV data to be written can be guaranteed. A method for deriving the time over time will be described later. If 300 milliseconds or more have elapsed since the write command was issued, the process proceeds to S5, and if it is 300 milliseconds or less, the process proceeds to S2.
[0124]
In S5, when 300 milliseconds or more have elapsed since the writing command was issued, the error monitoring means 6 instructs the AV recording / reproducing controller 3 to interrupt the writing process. Upon receiving an instruction from the error monitoring means 6, the AV recording / reproducing HDD controller 3 issues a write interruption command to the file system 4, and the file system 4 relays the write interruption command to the HDD 2. When the HDD 2 receives the write interruption command, the HDD 2 interrupts the writing process and proceeds to S6.
[0125]
In S6, the error monitoring unit 6 notifies the Skip process determining unit 5 that a defective disk access unit has been detected. When the skip process determining unit 5 is notified by the error monitoring unit 6 that a defective DAU has been detected, the skip process determining unit 5 starts the skip process. The skip process will be described later.
[0126]
On the other hand, in S3, when notifying the end of the write command, the HDD 2 also notifies whether it ended normally or due to an error. When the error monitoring means 6 receives the write command end notification from the HDD 2, it determines whether the write command has ended normally or due to an error.
[0127]
If the process ends due to an error, the process proceeds to S6. If the process ends normally, the process proceeds to S7.
[0128]
That is, in S6, the error monitoring means 6 tries to write AV data when a write error occurs when the write command ends in error or when the write command does not end after 300 milliseconds elapses. The disk access unit is determined as a defective disk access unit.
[0129]
In S7, when the write command is completed normally, the error monitoring unit 6 notifies the Skip processing determining unit 5 that the write command has been completed normally, and the AV recording / reproducing HDD controller 3 reads the next from the recording buffer 8. The next write command is issued at the timing when it is notified that the AV data for the disk access unit is stored.
[0130]
Next, the operation of the Skip process determination unit 5 will be described. FIG. 8 shows the operation of the Skip process determination means 5.
[0131]
In S10, when notified from the error monitoring means 6, the Skip process determining means 5 determines whether the notification is a notification that the write command has been completed normally or a notification that a defective disk access unit has been detected ( S11).
[0132]
If it is a notification that a defective disk access unit has been detected, the process proceeds to S12, and if it is a notification that the write command has been completed normally, the process proceeds to S15.
[0133]
In S15, when notified that the write command has been normally completed, the Skip process determination means 5 initializes the write skip flag of the disk access unit to 0, turns off the defective DAU flag, and proceeds to S16.
[0134]
On the other hand, in S12, when notified from the error monitoring means 6 that a defective disk access unit has been detected, the Skip processing determination means 5 adds 1 to the write skip counter of the disk access unit.
[0135]
Then, the defective DAU flag of the disk access unit is turned on (S13), and the process proceeds to S16.
[0136]
In S16, the Skip process determination means 5 acquires the number of the disk access unit to be written next from the file system 4, sets it as the current disk access unit, and proceeds to S17.
[0137]
In S17, the Skip process determination means 5 determines whether or not the current disk access unit is permanently defective. That is, when the value of the write skip counter of the current disk access unit exceeds 5, it is determined as a permanent failure, and when it is 5 or less, it is not determined as a permanent failure. The permanently defective disk access unit means a unit that cannot be written or read normally due to a defect in the disk access unit itself rather than a disturbance such as vibration.
[0138]
Here, the determination method of a permanent defect is demonstrated. Causes of the writing error and reading error of the recording / reproducing apparatus 1 include an error due to a disk defect, an error due to a random error, and an error due to disturbance such as vibration.
[0139]
Among these errors, an error due to a disk defect is an error that occurs when the disk access unit of the magnetic disk medium 20 of the HDD 2 is defective, and an error always occurs when reading from a defective disk access unit. Similarly, an error occurs when reading. On the other hand, an error due to a random error is an error that occurs due to random access to a disk access unit, and the probability that an error due to a random error will occur is 10^-12About small. In addition, errors due to disturbances such as vibrations differ depending on the use environment, but empirically 10 for a stationary use in a normal home.^-9The probability of occurrence.
[0140]
The permanent disk access unit is a disk access unit in which the disk access unit itself is defective as described above, and an error occurs every time such a disk access unit is written or read. Therefore, when the probability of occurrence of an error that occurs when writing to or reading from a certain disk access unit is greater than the probability of occurrence of an error due to a random error and the probability of occurrence of an error due to disturbance such as vibration, the disk access unit Can be determined to be permanently defective. Therefore, the probability that an error will occur when writing or reading is 10^-9If larger, it can be determined that the disk access unit is a permanently defective disk access unit.
[0141]
More specifically, assume that the usage frequency of the user is to use the recording / reproducing apparatus 1 for 5 years, the magnetic disk medium 20 of the HDD 2 has a capacity of 30 Gbytes, the size of the disk access unit is 1 Mbyte, and 8 hours a day. If it is assumed that data recording at 24 Mbps continues, on average, writing is performed twice a day in one disk access unit. Therefore, in 5 years, on average, writing is performed 2 × 365 × 5 = 3650 times in one disk access unit. Accordingly, when writing to a certain disk access unit only 3650 times, the number of times an error other than a disk defect occurs is about once or not. That is, errors due to disturbances such as vibrations occur only once every five years for one disk access unit, and errors due to random errors occur only once every ten years.
[0142]
Therefore, in this model, when a permanent error is detected twice, it can be determined that the error is due to a disk defect. That is, in this model, when the value of the write skip counter of the current disk access unit exceeds 1, it is determined as a permanent failure, and when it is 1 or less, it is not determined as a permanent failure. It can be determined whether the unit is permanently defective. Thus, when the skip counter value exceeds a predetermined value (1 in this model), it is determined as a permanent failure, and when it is equal to or less than the predetermined value, it is not determined as a permanent failure. It can be determined whether the unit is permanently defective. In addition, since the disc defect error determination differs depending on the use situation and the error characteristics of the media, it is necessary to determine a predetermined value for determining the permanent defect according to each application. In S17, in consideration of the fact that writing or reading to some disk access units of the magnetic disk medium 20 of the HDD 2 may occur more frequently than other disk access units may occur. A value of 5 was used.
[0143]
In S17, if the current disk access unit is permanently defective, the process proceeds to S16. If the current disk access unit is not permanently defective, the AV recording / reproducing HDD controller 3 is notified of the number of the disk access unit to be skipped, and the process proceeds to S18. That is, the disk access unit determined to be permanently defective is not used thereafter.
[0144]
For example, in the magnetic disk medium 20 of FIG. 5, the reusable defective DAU 22 has a write skip counter value of 5 or less, and a write process is performed on such a disk access unit. However, the non-reusable DAU 23 has a write skip counter value exceeding 5, and no write processing is performed on such a disk access unit.
[0145]
In S18, when the AV recording / reproducing HDD controller 3 is notified from the recording buffer 8 that the AV data to be written to the next disk access unit has been stored for the disk access unit, the AV recording / reproducing HDD controller 3 skips to Skip. For the disk access unit notified from the process determining means 5 that it should be skipped, the number of the disk access unit to be written next is skipped from the file system 4, and the process proceeds to S19.
[0146]
In S19, the AV recording / reproducing HDD controller 3 issues a write command for writing to the next disk access unit via the file system 4 to the HDD 2.
[0147]
In this way, the recording / reproducing apparatus 1 sequentially writes AV data to the disk access unit of the magnetic disk medium 20.
[0148]
As described above, when recording AV data, the recording / reproducing apparatus 1 of the present embodiment adds only 1 to the write skip counter of the disk access unit in which an error has occurred, and turns on the defective DAU flag. Then, AV data is written in the disk access unit to be written next to the disk access unit. A disk access unit whose write skip counter value exceeds 5 is regarded as a permanent failure and AV data is not written.
[0149]
If the writing is successful even once, the defective DAU flag of the disk access unit is turned off and the reading skip counter is set to zero. In this case, the write skip counter is left as it is.
[0150]
Therefore, unlike the conventional technique, the recording / reproducing apparatus 1 according to the present embodiment can continuously transfer AV data without interruption even though the disk access unit is not replaced. Further, even in a disk access unit in which writing is not completed after 300 milliseconds or more due to disturbance or the like, it can be reused.
[0151]
Next, an operation when the recording / reproducing apparatus 1 reproduces AV data recorded on the magnetic disk medium 20 will be described.
[0152]
It is assumed that AV data has already been recorded on the magnetic disk medium 20 as described above. When the recording / reproducing apparatus 1 is activated, the file system 4 loads file information, disk access unit information, and the DAU conversion table 53 from the magnetic disk medium 20 onto the memory of the file system 4.
[0153]
The AV recording / reproducing HDD controller 3 inquires about the number of the disk access unit to be read next from the file system 4.
[0154]
In response to this, the file system 4 notifies the AV recording / reproducing HDD controller 3 of the number of the disk access unit from which AV data is to be read from the file information.
[0155]
When notified from the file system 4 of the number of the disk access unit from which AV data is to be read, the AV recording / reproducing HDD controller 3 inquires about the head LBA of the disk access unit.
[0156]
Upon receiving an inquiry from the AV recording / reproducing HDD controller 3, the file system 4 obtains the head LBA of the disk access unit by using the DAU conversion table 53 shown in FIG. Then, the AV recording / reproducing HDD controller 3 is notified.
[0157]
When notified of the LBA, the AV recording / reproducing HDD controller 3 designates the number of sectors corresponding to the size of the LBA and the disk access unit, issues a read command to the file system 4, and the file system 4 is sent. Relay the read command to the HDD 2.
[0158]
The HDD 2 converts the notified LBA into a track number and a sector number using the table of FIG. 17, reads AV data from the sector constituting the corresponding track of the magnetic disk medium 44, and transfers it to the AV recording / reproducing HDD controller 3. To do.
[0159]
The AV recording / reproducing HDD controller 3 transfers the read AV data to the reproduction buffer 9.
[0160]
The playback buffer 9 stores the AV data transferred from the AV recording / playback HDD controller 3 and outputs the stored AV data in real time.
[0161]
When the playback buffer 9 has a free space of one disk access unit or more, the AV recording / playback HDD controller 3 is notified of this.
[0162]
The AV recording / reproducing controller 3 issues a read command to the file system 4 at the timing when the reproduction buffer 9 is notified that there is space for the disk access unit. Thereafter, the same operation as described above is repeated, and AV data is read one after another.
[0163]
When reproducing AV data in this way, the error monitoring means 6 monitors whether a read command issued by the AV recording / reproducing HDD controller 3 has been executed normally or whether an error has occurred, thereby causing defective disk access. Detect unit.
[0164]
That is, FIG. 7 shows the operation of the error monitoring means 6. Hereinafter, the operation of the error monitoring means 6 will be described with reference to FIG.
[0165]
When the AV recording / reproducing HDD controller 3 issues a read command as described above (S1), the error monitoring means 6 enters an error monitoring operation. That is, the timer 7 is used to measure the time that has elapsed since the AV recording / reproducing HDD controller 3 issued the read command.
[0166]
Then, the error monitoring unit 6 determines whether a read command end notification is sent from the HDD 2 (S2). If a read command end notification has not been sent from the HDD 2, the process proceeds to S4. If a read command end notification has been sent from the HDD 2, the process proceeds to S3.
[0167]
In S4, the error monitoring unit 6 determines whether or not the elapsed time after the read command is issued is 300 milliseconds or more. This 300 millisecond time is the time over time derived from the continuity of the AV data. That is, if the reading process is completed within 300 milliseconds, AV data can be reproduced continuously without interruption. A method for obtaining the time over time will be described later. If 300 milliseconds or more have elapsed since the read command was issued, the process proceeds to S5, and if 300 milliseconds or less, the process proceeds to S2.
[0168]
In S5, when 300 milliseconds or more have elapsed since the read command was issued, the error monitoring means 6 instructs the AV recording / reproducing controller 3 to interrupt the reading process. Upon receiving an instruction from the error monitoring means 6, the AV recording / reproducing HDD controller 3 issues a read interruption command to the file system 4, and the file system 4 relays the read interruption command to the HDD 2. When the HDD 2 receives the reading interruption command, the HDD 2 interrupts the reading process and proceeds to S6.
[0169]
In S6, the error monitoring unit 6 notifies the Skip process determining unit 5 that a defective disk access unit has been detected. When the skip process determining unit 5 is notified by the error monitoring unit 6 that a defective DAU has been detected, the skip process determining unit 5 starts the skip process. The skip process will be described later.
[0170]
On the other hand, in S3, when the HDD 2 notifies the end of the read command, it also notifies whether it has ended normally or due to an error. When the error monitoring means 6 receives a read command end notification from the HDD 2, the error monitoring means 6 determines whether the read command ended normally or due to an error. If the process ends due to an error, the process proceeds to S6. If the process ends normally, the process proceeds to S7.
[0171]
That is, in S6, the error monitoring means 6 tries to read AV data, assuming that a read error has occurred when the read command has ended in error, or if the read command has not ended even after 300 milliseconds have elapsed. The disk access unit is determined as a defective disk access unit.
[0172]
In S7, when the read command is normally completed, the error monitoring means 6 notifies the Skip processing determining means 5 that the read command has been normally completed, and the AV recording / reproducing HDD controller 3 reads the read buffer 9 into the reproduction buffer 9. The next read command is issued at the timing when the reproduction buffer 9 is notified that the reproduction buffer 9 has output the AV data for the disk access unit.
[0173]
Next, the operation of the Skip process determination unit 5 will be described. FIG. 9 shows the operation of the Skip process determination means 5.
[0174]
In S20, when notified from the error monitoring unit 6, the Skip process determining unit 5 determines whether the notification is a notification that the read command has been completed normally or a notification that a defective disk access unit has been detected ( S21).
[0175]
If the notification from the error monitoring unit 6 is a notification that the read command has been completed normally, the process proceeds to S25. If the notification indicates that a defective disk access unit has been detected, the process proceeds to S22.
[0176]
In S22, when the error monitoring unit 6 notifies that a defective disk access unit has been detected, the Skip process determination unit 5 adds 1 to the read skip counter of the disk access unit, and proceeds to S23.
[0177]
In S23, the Skip process determination unit 5 determines whether or not the value of the read skip counter exceeds 5. If it exceeds 5, the process proceeds to S24, and if it is 5 or less, the process proceeds to S25.
[0178]
In S24, the Skip process determination unit 5 turns on the defective DAU flag of the disk access unit, and proceeds to S25.
[0179]
In S25, the Skip process determination means 5 acquires the number of the disk access unit to be read next from the file system 4, sets it as the current disk access unit, and proceeds to S26.
[0180]
In S26, the Skip process determination means 5 determines whether the current DAU flag of the disk access unit is on or off. That is, if the defective DAU flag of the current disk access unit is on, the process proceeds to S25. If the defective DAU flag of the current disk access unit is off, the AV recording / reproducing HDD controller 3 is notified of the number of the disk access unit whose defective DAU flag is on, and the process proceeds to S27.
[0181]
In S27, the AV data for the disk access unit is output from the playback buffer 9, and when the playback buffer 9 is notified that the space for one disk access unit has been generated, the AV recording / playback HDD controller 3 performs the skip process. The disk access unit notified from the determination means 5 is skipped, the number of the disk access unit to be written next is acquired from the file system 4, and the process proceeds to S28.
[0182]
In S28, the AV recording / reproducing HDD controller 3 issues a read command for reading AV data from the next disk access unit to the HDD 2 via the file system 4.
[0183]
In this way, the recording / reproducing apparatus 1 reads AV data from the magnetic disk medium 20 one after another.
[0184]
As described above, the recording / reproducing apparatus 1 of the present embodiment adds 1 to the read skip counter of the disk access unit when an error occurs during reading. For a disk access unit whose read skip counter value exceeds 5, the defective DAU flag is turned on. Further, the reading process is not performed for the disk access unit whose defective DAU flag is on.
[0185]
Accordingly, even during reading, unlike the conventional technique, the recording / reproducing apparatus 1 of the present embodiment can continuously transfer AV data without interruption even though the disk access unit is not replaced. .
[0186]
Next, an operation for erasing AV data recorded on the magnetic disk medium 20 will be described.
[0187]
AV data recorded on the magnetic disk medium 20 is managed as an object. That is, the object refers to AV data from when the recording start button of the recording / playback apparatus is pressed until the recording stop button is pressed. During this time, the pause button of the recording / reproducing apparatus may be inserted.
[0188]
FIG. 12 shows an operation when erasing an object recorded on the magnetic disk medium 20. Hereinafter, a description will be given with reference to FIG.
[0189]
In S40, the AV recording / reproducing HDD controller 3 starts an erasing process. That is, the disk access unit number of the file to be erased is acquired from the file system 4 and an erase command for erasing the AV data recorded in the disk access unit is issued.
[0190]
When the file system 4 receives the erase command, the file system 4 initializes a table associating the file to be erased with the disk access unit and writes it to the HDD 2.
[0191]
That is, the table includes a defective DAU flag and a skip counter. When the table is initialized, the file system 4 turns off the defective DAU flag (S41) and initializes the reading skip counter to 0. (S42).
[0192]
Note that the write skip counter of the erased disk access unit is not initialized and is left as it is. Therefore, a disk access unit having a write skip counter value exceeding 5 cannot be reused even if AV data is erased. On the other hand, a disk access unit having a write skip counter of 5 or less can be reused when AV data is erased.
[0193]
FIG. 5 shows the magnetic disk medium before the object is erased as the magnetic disk medium 20, and FIG. 6 shows the magnetic disk medium after the object is erased as the magnetic disk medium 30.
[0194]
Object 0 (24) and object 1 (25) are recorded on the magnetic disk medium 20. In the disk access unit in which the object 0 (24) is recorded, a reusable defective DAU 22 having a write skip counter value of 5 or less and a reusable defective DAU 23 having a write skip counter value exceeding 5 are included. is there.
[0195]
After the object is erased, the reusable defective DAU 22 has a write skip counter value of 5 or less, the read skip counter value is initialized to 0, and the defective DAU flag is turned off. Reused as shown in possible DAU 28. On the other hand, the defective DAU 23 that cannot be reused is not reused as indicated by the defective DAU 29 that cannot be reused because the value of the write skip counter exceeds 5 even after the object is erased.
[0196]
Therefore, a disk access unit without a defect due to a disturbance such as vibration is not permanently treated as a defective disk access unit, and a disk access unit without a defect can be reused.
[0197]
In the above description, the case where AV data is recorded and the case where it is reproduced is described separately. However, the recording / reproducing apparatus 1 of the present embodiment records the AV data simultaneously on the magnetic disk medium 20 while recording the AV data. It is also possible to reproduce existing AV data. When reproducing AV data already recorded while recording AV data at the same time, the AV recording / reproducing HDD controller 3, the error monitoring means 6, and the Skip process determining means 5 perform the above-described recording operation and reproduction in a time division manner. Perform the action.
[0198]
Now, as described above, how to obtain 300 milliseconds, which is the time over time, will be described.
[0199]
The recording / reproducing apparatus 1 of the present embodiment also reproduces the continuity of recorded AV data when performing simultaneous recording / reproducing to reproduce the AV data recorded on the magnetic disk medium 20 while recording the AV data. It is assumed that the continuity of the AV data is also guaranteed, and the continuity of the AV data is guaranteed until a defect in the disk access unit occurs uniformly with a probability of 30% in both writing and reading.
[0200]
The recording buffer 8 can store AV data for up to three disk access units, and the playback buffer 9 can store AV data for up to three disk access units. Suppose there is.
[0201]
Then, the time required for writing to or reading from a disk access unit that is not defective is set to 160 milliseconds. Further, the time required to output or input AV data for one disk access unit is 560 milliseconds.
[0202]
Then, the time for storing the AV data for three disk access units in the recording buffer 8 or the time for outputting the AV data for three disk access units from the reproduction buffer 9 is 560 × 3 milliseconds. . The time for performing read processing on the three disk access units and performing write processing on the three disk access units is 160 milliseconds × 3 × 2 + (Tout−160), assuming that the time-over time Tout. It becomes x3x0.3x2. In order to guarantee the continuity of the AV data, this time is the time for storing AV data for three disk access units in the recording buffer 8 and the AV data for three disk access units from the reproduction buffer 9. Since it must be smaller than the time to be output, the following relationship of Equation 1 must be established.
[0203]
[Expression 1]
160 × 3 × 2 + (Tout−160) × 3 × 0.3 × 2 <560 × 3
Expression 1 to Tout must satisfy Expression 2 shown below.
[0204]
[Expression 2]
Tout <560
In addition, when AV data for three disk access units is written and AV data for three disk access units is simultaneously read, the continuity of the AV data is guaranteed when a timeout occurs once each in the writing and reading processes. In order to do this, the following relationship of Equation 3 must be established.
[0205]
[Equation 3]
160 milliseconds × 2 × 2 + Tout × 2 <560 × 3
From Expression 3 to Tout, the following Expression 4 must be satisfied.
[0206]
[Expression 4]
Tout <520 ms
Therefore, the time over time must be set shorter if a timeout occurs once for each reading and writing.
[0207]
Furthermore, when a time-over occurs when performing a read process, if the retry process for reading from the disk access unit is performed only once, the following equation 5 must be satisfied.
[0208]
[Equation 5]
160 milliseconds × 2 × 2 + Tout × 3 <560 × 3
From Expression 5 to Tout, the following Expression 6 must be satisfied.
[0209]
[Formula 6]
Tout <347 milliseconds
Therefore, if a time-out occurs in the read process, the time-over time may be set to 347 milliseconds or less if it is allowed to read the disk access unit once again. Further, when Tout is set to 347 milliseconds or less, all the conditions of Formulas 1 to 6 can be satisfied.
[0210]
The time over time of 300 milliseconds in the present embodiment is obtained by performing the above consideration.
[0211]
In the present embodiment, the recording / reproducing apparatus 1 using the magnetic disk medium 20 has been described. However, a recording / reproducing apparatus using another recording medium may be used.
[0212]
For example, FIG. 2 shows a recording / reproducing apparatus 11 that uses a DVDRAM as a recording medium. Unlike the recording / reproducing apparatus 1 of FIG. 1, the recording / reproducing apparatus 11 includes an AV recording / reproducing DVD controller 13 and a DVDRAM drive 12. The AV recording / reproducing DVD controller 13 controls the DVDRAM drive 12 in the same manner as the AV recording / reproducing HDD controller 3 controls the HDD 2. The file system 4 is the same as the fill system of the recording / reproducing apparatus 1 except that the number of the disk access unit is converted to the LBA of the DVDRAM. The other blocks of the recording / reproducing apparatus 11 are the same as those of the recording / reproducing apparatus 1. As described above, the present embodiment can be applied not only to a recording / reproducing apparatus using an HDD but also to a recording / reproducing apparatus using a DVD.
[0213]
  FIG. 3 shows a recording / reproducing apparatus 14 that uses a magneto-optical disk as a recording medium. Unlike the recording / reproducing apparatus 1 of FIG. 1, the recording / reproducing apparatus 14 includes an AV recording / reproducing DVD controller 16 and an MO drive 15. The AV recording / reproducing DVD controller 16 controls the MO drive 15 in the same manner as the AV recording / reproducing HDD controller 3 controls the HDD 2. The file system 4 assigns the disk access unit number to the MO drive.LExcept for conversion to BA, the file system 4 is the same as that of the recording / reproducing apparatus 1. Other blocks of the recording / reproducing apparatus 14 are the same as those of the recording / reproducing apparatus 1. Thus, the present embodiment can be applied to a recording / reproducing apparatus using a magneto-optical disk medium.
[0214]
Furthermore, in this embodiment, if the command does not end even if the elapsed time after the write command or the read command is issued exceeds 300 milliseconds, the error monitoring means 6 detects a defective disk access unit. The Skip process determination unit 5 is notified of this, but the present invention is not limited to this. The error monitoring unit 6 may notify the skip processing determining unit 5 that a defective disk access unit has been detected even when a command error occurs in the issued write command or read command. The command error in this case is that when a write command or a read command is issued to the HDD 2 and the HDD 2 cannot execute the command for some reason, the HDD 2 notifies within 300 milliseconds which is a time over time. Such an error occurs when an ECC (error correction) error during a read operation or when a command is issued when the HDD 2 is initialized.
[0215]
  Furthermore, the case where the write error of the present invention occurs is not limited to the case where the write command is issued, even if the elapsed time from the issue of the write command is 300 milliseconds or more does not end.TheWhen the HDD 2 notifies that the command cannot be executed within 300 millimeters of the elapsed time from the start time, the write error of the present invention is basically the time over time derived from the continuity of the AV data. Even when the recording has elapsed, recording of AV data in the disk access unit may not be completed, or a command error may occur.
[0216]
Note that, in S24 of FIG. 9 of the present embodiment, the Skip process determining unit 5 has been described as turning on the defective DAU flag of the disk access unit and proceeding to S25, but this is not a limitation. That is, as shown in FIG. 10, in S24, the Skip process determining means 5 turns on the defective DAU flag of the disk access unit and proceeds to S24a. In S24a, the Skip process determining means 5 sets the write side skip counter. It may be incremented by 1 before proceeding to S25. Depending on the specifications of the recording / reproducing apparatus 1, there may occur a case where it is determined that the writing has been normally completed although the AV data has not been normally written to the disk access unit. In such a case, an error always occurs when the disk access unit is read. Therefore, as shown in FIG. 10, by executing S24a after S24, it is determined that the writing is normally completed even though the AV data is not normally written normally to the disk access unit. Even in such a case, it is possible to accurately determine whether the disk access unit is permanently defective.
[0217]
(Second Embodiment)
Next, a second embodiment will be described.
[0218]
FIG. 4 shows the recording / reproducing apparatus 17 of the present embodiment.
[0219]
The recording / reproducing apparatus 17 of this embodiment includes an AV recording / reproducing HDD controller 18 instead of the AV recording / reproducing HDD controller 3 of the recording / reproducing apparatus 1 of the first embodiment.
[0220]
Unlike the AV recording / reproducing HDD controller 3 of the first embodiment, the AV recording / reproducing controller 18 is stored in the reproduction buffer 9 when an error occurs in reading of the disk access unit during reproduction. This is a means for controlling the HDD 2 to repeatedly read data from the disk access unit until all data is output.
[0221]
Since other than that is the same as that of 1st Embodiment, description is abbreviate | omitted.
[0222]
Next, the operation of this embodiment will be described.
[0223]
The operation for recording AV data is the same as that of the first embodiment.
[0224]
When reproducing AV data, the error monitoring means 6 monitors whether or not an error has occurred in the reading process in the same manner as in the first embodiment.
[0225]
FIG. 11 shows the operation of the Skip process determination means 5. This will be described below with reference to FIG.
[0226]
In S30, when notified from the error monitoring unit 6, the Skip process determining unit 5 determines whether the notification is a notification that the read command has been completed normally or a notification that a defective disk access unit has been detected ( S31).
[0227]
If the notification from the error monitoring unit 6 is a notification that the read command has been completed normally, the process proceeds to S37. If the notification indicates that a defective disk access unit has been detected, the process proceeds to S32.
[0228]
In S32, when notified from the error monitoring means 6 that a defective disk access unit has been detected, the Skip process determining means 5 adds 1 to the read skip counter of the disk access unit, and proceeds to S33.
[0229]
In S <b> 33, the Skip process determination unit 5 determines whether or not the value of the read skip counter exceeds 5. If it exceeds 5, the process proceeds to S34, and if it is 5 or less, the process proceeds to S35.
[0230]
In S35, the Skip processing determination means 5 inquires of the AV recording / reproducing HDD controller 18 whether or not the reproducing buffer 9 is empty. The AV recording / reproducing HDD controller 18 checks the state of the reproduction buffer 9 in response to an inquiry from the Skip processing determination unit 5 and notifies the Skip processing determination unit 5 whether or not the reproduction buffer 9 is empty. If the reproduction buffer 9 is empty, the Skip process determination unit 5 proceeds to S37. If the reproduction buffer 9 is not empty, the process proceeds to S36.
[0231]
In S36, the Skip process determining means 5 instructs the AV recording / reproducing HDD controller 18 to perform the reading process again on the disk access unit in which the error has occurred, and the AV recording / reproducing controller 18 receives from the Skip process determining means. When instructed, it issues a read command to read the disk command again. The error monitoring means 6 monitors whether or not an error has occurred in the reading process in the same manner as in the first embodiment.
[0232]
In S34, since the value of the read skip counter exceeds 5, the Skip process determination means 5 turns on the defective DAU flag of the disk access unit, and proceeds to S37.
[0233]
In S37, the Skip process determination means 5 acquires the number of the disk access unit to be read next from the file system 4, sets it as the current disk access unit, and proceeds to S38.
[0234]
In S38, the Skip process determination means 5 determines whether the defective DAU flag of the current disk access unit is on or off. That is, if the defective DAU flag of the current disk access unit is on, the process proceeds to S37. If the defective DAU flag of the current disk access unit is off, the AV recording / reproducing HDD controller 18 is notified of the number of the disk access unit whose defective DAU flag was on, and the process proceeds to S39.
[0235]
In S39, when it is notified from the reproduction buffer 9 that AV data for the disk access unit has been output, the AV recording / reproducing HDD controller 18 skips the disk access unit notified from the Skip processing determination means 5. The number of the disk access unit to be written next is acquired from the file system 4, and the process proceeds to S40.
[0236]
In S40, the AV recording / reproducing HDD controller 3 issues a read command for reading AV data from the next disk access unit to the HDD 2 via the file system 4.
[0237]
In this way, the recording / reproducing apparatus 1 reads AV data from the magnetic disk medium 20 one after another. When an error occurs in the disk access unit, the reading process is repeatedly performed on the disk access unit until the recording buffer 9 becomes empty.
[0238]
Therefore, in addition to the effects of the first embodiment, it is possible to further improve the reliability of AV data reproduction compared to the first embodiment while continuously reproducing AV data without interruption.
[0239]
Note that the time-over time of the present invention is not limited to 300 milliseconds in the embodiment, but may be 310 milliseconds, 280 milliseconds, etc., as long as it is a time that can guarantee the continuity of AV data. Good.
[0240]
Furthermore, the skip counter of the present invention is not limited to a separate one corresponding to the read process and the write process, such as the write skip counter and the read skip counter in the present embodiment, and reads and writes are counted together. It may be a thing. In short, the skip counter of the present invention only needs to count the number of times the disk access unit is skipped.
[0241]
Further, the predetermined number of times of the present invention is not limited to five times in the present embodiment, and may be four times, seven times, etc. In short, the predetermined number of times according to the present invention determines that the disk access unit is not permanently required. It is only necessary that the number of times is appropriate.
[0242]
Further, the recording medium of the present invention is not limited to the magnetic disk medium 20 in the present embodiment, but the recording medium of the present invention such as a magneto-optical disk medium or an optical disk medium can record or reproduce AV data. All you have to do is
[0243]
Furthermore, the recording medium of the present invention may be built in the recording / reproducing apparatus of the present invention or may be detachable.
[0244]
Further, the present invention is a program for causing a computer to execute the functions of all or a part of the recording / reproducing apparatus of the present invention described above (or an apparatus, element, circuit, unit, etc.). It is a program that works and works.
[0245]
Furthermore, the present invention is a medium carrying a program for causing a computer to execute all or part of the functions of all or part of the above-described recording / reproducing apparatus of the present invention. The program is a medium for executing the function in cooperation with the computer.
[0246]
Note that a part of the means of the present invention (or an apparatus, an element, a circuit, a part, etc.) means some of the plurality of means, or one of the means, It means some functions.
[0247]
Further, the present invention includes a computer-readable recording medium that records the program of the present invention.
[0248]
Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.
[0249]
Further, one usage form of the program of the present invention may be an aspect in which the program is transmitted through a transmission medium, read by a computer, and operated in cooperation with the computer.
[0250]
The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet, light, radio waves, sound waves, and the like.
[0251]
The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.
[0252]
As described above, the configuration of the present invention may be realized by software or hardware.
[0253]
【The invention's effect】
  As is apparent from the above description, the present invention provides a recording / reproducing apparatus and a recording / reproducing method capable of continuously transferring AV data without interruption without time and effort.,ProgramAnd recording mediumCan be provided.
[0254]
  The present invention also provides a recording / reproducing apparatus capable of continuously transferring AV data without interruption without erasing the AV data already recorded on the recording medium.,ProgramAnd recording mediumCan be provided.
[0255]
  The present invention also provides a recording / reproducing apparatus capable of continuously transferring AV data without interruption without reducing the area that the user can freely use.,ProgramAnd recording mediumCan be provided.
[0256]
  In addition, the present invention is a recording method in which a defect-free disk access unit is not permanently treated as a defective disk access unit due to a disturbance such as vibration, and a defect-free disk access unit can be reused. Playback device,ProgramAnd recording mediumCan be provided.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a recording / reproducing apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a recording / reproducing apparatus for recording / reproducing information on a DVD according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a configuration of a recording / reproducing apparatus for recording / reproducing information on a magneto-optical disk according to the first embodiment of the present invention.
FIG. 4 is a diagram showing a configuration of a recording / reproducing apparatus according to a second embodiment of the present invention.
FIG. 5 is a diagram showing an example of a magnetic disk medium according to the first embodiment of the invention.
6 is a diagram showing an example of a magnetic disk medium when AV data is erased in the embodiment of the table 1 of the present invention. FIG.
FIG. 7 is a flowchart showing the operation of the error monitoring unit in the first embodiment of the present invention.
FIG. 8 is a flowchart showing an operation at the time of recording of the Skip process determination unit in the first embodiment of the present invention.
FIG. 9 is a flowchart showing an operation at the time of reproduction of the Skip process determination unit in the first embodiment of the present invention.
FIG. 10 is another flowchart showing the operation at the time of reproduction of the skip processing determination unit in the first embodiment of the present invention.
FIG. 11 is a flowchart showing an operation at the time of reproduction of the Skip process determination unit in the second embodiment of the present invention.
FIG. 12 is a flowchart showing an operation when erasing AV data in the recording / reproducing apparatus in the first embodiment of the present invention.
FIG. 13 is a diagram showing a configuration of a conventional recording / reproducing apparatus.
FIG. 14 is a diagram showing an example of a magnetic disk medium recorded and reproduced by a conventional recording / reproducing apparatus.
FIG. 15 is a diagram showing an example of a replacement DAU table of a conventional recording / reproducing apparatus.
FIG. 16 is a diagram showing an example of a DAU conversion table used by a conventional recording / reproducing apparatus and the recording / reproducing apparatus of the present embodiment.
FIG. 17 is a diagram showing a table for associating LBAs used by a conventional recording / reproducing apparatus and the recording / reproducing apparatus of the present embodiment with physical addresses;
[Explanation of symbols]
1 Recording and playback device
2 HDD
3 HDD controller for AV recording / playback 3
4 File system
5 Skip processing determination means
6 Error monitoring means
7 Timer
8 Recording buffer
9 Playback buffer
11 Recording / playback device
12 DVDRAM drive
13 DVD controller for AV recording and playback
14 Recording / playback device
15 MO drive
16 AV recording / playback MO controller
17 Recording / playback device
18 AV recording / playback controller
20 Magnetic disk media
22 Reusable defective DAU
23 Reuse-added defective DAU
26 AV data recording area
27 Magnetic disk media

Claims (13)

Recording means capable of writing and reading AV data to and from a recording medium;
Time determined to guarantee both continuity of AV data to be recorded and reproduced when performing simultaneous recording and reproduction of AV data with respect to a disk access unit which is a minimum unit for continuously accessing the recording medium. An error determination means for determining that an AV data write or read error has occurred when writing or reading of the AV data is not completed in the disk access unit even if an over time has elapsed;
Based on the determination, if an AV data write or read error occurs in the disk access unit, the disk access unit in which the write or read error occurred is skipped without providing a replacement disk access unit. Recording control means for controlling the recording means to write or read the AV data to a disk access unit to be written or read next;
A skip counter that counts the number of errors that occurred when the AV data was written or read from the disk access unit;
The recording control means, when the number of times exceeds a predetermined value which is a value of 1 or more, prohibits writing or reading of the disk access unit, and controls not to use it thereafter apparatus. The recording / reproducing apparatus according to claim 1 , wherein the error determination unit determines that the write error or the read error has occurred when a command error occurs. If writing or reading of the AV data to the disk access unit is not completed even after the time-over time elapses, the recording control means forcibly terminates the command issued to the recording means, whereby the disk access unit 2. The recording / reproducing apparatus according to claim 1 , wherein the recording / reproducing apparatus is controlled so as to skip. Number of times the skip counter counts the recording and reproducing apparatus according to claim 1, wherein the recording medium is not initialized unless formatting process. A read prohibition flag indicating whether to prohibit reading of the disk access unit;
The recording control means, when the read prohibition flag corresponding to the disk access unit is turned on, the recording control means does not read the disk access unit,
2. The recording / reproducing apparatus according to claim 1 , wherein when the read prohibition flag corresponding to the disk access unit is turned off, control is performed so that the disk access unit is read. The recording control means may control, when the write error in writing the AV data to the disk access unit occurs, to claim 5, characterized in that to turn on the read prohibit flag corresponding to the disk access unit The recording / reproducing apparatus as described . When the AV data can be normally written to the disk access unit, the recording control unit turns off the read prohibition flag corresponding to the disk access unit, and sets the value of the read skip counter corresponding to the disk access unit. 7. The recording / reproducing apparatus according to claim 6, wherein the recording / reproducing apparatus is initialized to zero. When the AV data recorded in the disk access unit is erased, the recording control means turns off the read prohibition flag corresponding to the disk access unit, and the read skip counter corresponding to the disk access unit 7. The recording / reproducing apparatus according to claim 6, wherein the value of is initialized.   A recording buffer for temporarily storing the AV data when the AV data is written;
  A reproduction buffer for temporarily storing the AV data when the AV data is read; With
  The time over time includes at least the storage time of the AV data in the recording buffer, the output time of the AV data from the reproduction buffer, the time required for reading the disk access unit, and the writing of the disk access unit. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is calculated based on a required time. A recording step capable of writing and reading AV data to and from a recording medium;
Time determined to guarantee both continuity of AV data to be recorded and played back when simultaneous recording and playback of AV data is performed with respect to a disk access unit which is a minimum unit for continuously accessing the recording medium. An error determination step for determining that an AV data write or read error has occurred when writing or reading of the AV data to the disk access unit is not completed even if an overtime has elapsed;
Based on the determination, if an AV data write or read error occurs in the disk access unit, the disk access unit in which the write or read error occurred is skipped without providing a replacement disk access unit. A recording control step for controlling the recording means to write or read the AV data to a disk access unit to be written or read next;
A skip counter step of counting the number of errors that occurred when the AV data was written or read from the disk access unit,
In the recording control step, when the number of times exceeds a predetermined value which is a value of 1 or more, writing or reading of the disk access unit is prohibited and control is performed so as not to be used thereafter. Method. 11. The recording / reproducing method according to claim 10 , wherein the error determining step determines that the writing error or the reading error has occurred when a command error occurs. Of the recording and reproducing apparatus according to claim 1, wherein the writing of AV data to a recording medium, read and capable recording hand stage,
Time determined to guarantee both continuity of AV data to be recorded and reproduced when performing simultaneous recording and reproduction of AV data with respect to a disk access unit which is a minimum unit for continuously accessing the recording medium. An error judging means for judging that an AV data writing or reading error has occurred when the writing or reading of the AV data is not completed in the disk access unit even if the over time has elapsed;
Based on the determination, if an AV data write or read error occurs in the disk access unit, the disk access unit in which the write or read error occurred is skipped without providing a replacement disk access unit. Recording control means for controlling the recording means to write or read the AV data to a disk access unit to be written or read next;
A program for causing a computer to function as a skip counter that counts the number of errors that occur when the AV data is written or read from the disk access unit . A recording medium on which the program according to claim 12 is recorded, wherein the recording medium can be processed by a computer .

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