JPS6361468A - Alternate processor for recording medium - Google Patents

Abstract

PURPOSE:To prevent an alternate area from being used completely in one alternate processing, by providing a means which performs the alternate write of data in a prescribed block to a block different physically, and permits it recursively, and a means which limits the number of times of the alternate write, in an alternate processor. CONSTITUTION:Write check is performed by storing the data stored transiently in a buffer memory RAM 22, in an optical disk memory device 5 after reading it out, and verifying it. Next, when an added data is written on the memory, it is written on the postscript area 102 of the memory, and is verified, and when a sector is a defective sector 103 in which postscript is not performed normally, it is postscripted to an alternate sector 111 positioning it behind a written part on the RAM 22. Afterwards, the data is verified, and the fact that the sector 103 is altered to the sector 111 is postscripted in an alternate information table, and the content of the alternate sector postscripted at the last stage, is stage, is stored in the disk device as the latest information.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a recording medium replacement processing device.

[Prior Art] Conventionally, when a write-once optical disc or the like is subjected to alternate writing processing to its sector, defects such as defects generated during the manufacturing process of the recording medium, scratches on the surface, and dust attached afterwards, etc. As a result, the sector to be replaced becomes a defective sector, and replacement writing may not be performed normally. In this case, since the defect in the recording medium is local, alternate writing is performed in a physically different sector from the defective sector.

On the other hand, the size of the replacement write area (that is, the number of sectors) is set by adding some margin to the value calculated based on the probability of occurrence of each defect described above. Furthermore, the defect may extend over two adjacent sectors, and replacement writing within the replacement writing area often allows recursive replacement, such as further replacement.

However, in addition to local defects on the optical disc side, writing may not be performed normally due to problems with the optical disc drive. In many cases, write failures caused by this drive cannot be recovered even after replacing the drive several times, and as the replacement progresses, there is a problem in that the replacement area may be used up. In this case, it is necessary to re-declare the spare area in the optical disk ID section. And, unless this declaration is made, further writing will not be possible.

[Object of the Invention] The present invention has been made by focusing on the problems of the conventional device described above, and provides a recording medium that can prevent the replacement area from being exhausted due to the progress of replacement that occurs during the -degree replacement process. The purpose is to provide replacement processing bags.

[Embodiments of the invention] FIG. 1 is a block diagram showing one embodiment of the present invention.

The CPU (central processing unit) 20 is composed of a microcomputer and also serves as an image sending command means. ROM (
The read-only memory (read-only memory) 21 has a system control program written therein in advance.

The CPU 20 performs control operations according to programs written in the ROM 21.

Further, the CPU 20 and the ROM 21 are examples of a recursive permission means and a recursive alternating write number limit means. The recursive permitting means is a means for alternately writing data in a predetermined block into physically different blocks and recursively permitting this alternate writing, and the recursive alternate writing count limiting means is a means for alternately writing data in a predetermined block to physically different blocks, and recursively permitting this alternate writing. This is a means for limiting the number of times of alternate writing to a predetermined number of times.

The RAM (random access memory) 22 is mainly composed of C
It is used as a page memory for storing image signals exchanged between the working memory of the PU 20 and each input/output unit. External memory 2 consisting of hard disk
Reference numeral 3 stores a control program for the one-image file system, a database for image retrieval from the optical disk device 5, and the like.

The league interface 25 is for exchanging information with the leader 2, and the printer interface 26 is for exchanging information with the printer 3. , the optical disk interface 28 is for exchanging information with the optical disk device 5, and the CRT interface 27 is for exchanging information with the optical disk device 5.
It exchanges information with 4. Note that a 16-bit bus 29 is used to transfer signals between each block in the control unit l.
and a keyboard 24 are provided.

FIG. 2 is a diagram showing the format of the optical disc in the above embodiment.

In this figure, the optical disk controller is provided with a buffer memory (RAM 22) for n sectors, and write data transferred from the host computer is recorded on the optical disk while being temporarily stored in the buffer in units of n sectors. Of course, if the amount of data written at - degree is less than n sectors, only that number of sectors are stored at - time and stored in the optical disk device 5.

In the above embodiment, the data temporarily stored in the buffer memory is recorded in the optical disk device 5, and then the recorded data is read and the read data and the data on the buffer memory are verified. , performs a writing check.

Now, consider a case where data on the buffer memory is additionally written after the already written data shown in FIG.

FIG. 3 is a diagram showing the format of the buffer memory for n sectors in the above embodiment.

Data 201 on the buffer memory is additionally written after the write data. This additionally recorded portion is shown as 102 in FIG. Added part 1 immediately after adding
02 write check is performed. This check is
Data on the corresponding buffer memory is sequentially verified one sector at a time from the first sector of the additional write portion 102. As a result of verification, if a sector (defective sector) 103 in which additional writing has not been performed normally is detected, the optical disk controller updates the data 202 on the corresponding buffer memory.
is added to the replacement sector 111 after the already written portion of the replacement area. After appending, sector tti is also verified, and when it is confirmed that the appending was successful, information that sector 103 has been replaced with sector 111 is stored in the replacement information table prepared on the main memory of the optical disk controller. will be newly added to.

Thereafter, the delivery information on the main memory, including the added information, is added to the replacement information area of the optical disc.

FIG. 4 is a diagram showing the format of the additionally written replacement information sector 106.

FIG. 4(a) shows the contents of the replacement information sector 104, and shows that the sector 112 at address 2100 on the 19th floor has been replaced with the sector 108 at address 1000 (relative address O) in the replacement area. . In addition, FIG. 4(b) shows that 1
A diagram showing that sector 113 at address 0003 was replaced by sector 109 at address 1001 (relative address 1), but the replacement was not performed normally and was eventually replaced by sector 110 at address 1002 (relative address 2). It is.

Furthermore, FIG. 4(c) shows sector 10 at address 50118.
3 is number 1003 J1! ! It is a diagram in which information indicating that sector 111 (relative number i1!3) has been replaced is added.

In this way, the replacement information sector increases by at least one sester every time l sector replacement processing occurs.
In addition, the replacement information sector itself is also subject to replacement processing,
As a result of verification, if it is determined that writing to the replacement information sector is not normal, replacement processing is performed to the next address, which is an unwritten sector.

In other words, the content of the last added replacement information sector becomes the latest replacement information, and this optical disc is transferred to the optical disk device 5.
When the disk is loaded again, the contents of the replacement information sector are read onto the main memory of the optical disk controller. With this, the optical disk controller checks whether or not the corresponding sector has been replaced in response to a read access from the host computer by searching for replacement information on the main memory, and if replacement has occurred, the replacement information The replaced sector is accessed by the replacement address inside.

Replacement in the replacement area and replacement information area.

As mentioned above, the replacement is performed to the next address, but during the - degree replacement process, the replacement is limited to three times, and if the replacement cannot be processed normally even after three replacements, the host computer displays this as an error status. to notify.

FIG. 5(a) is a diagram showing a case where, while data 404 transferred from the host computer is being additionally written on the optical disc, writing is no longer performed normally due to a problem with the optical disc drive.

Verification after writing causes a write error in sector 403, and its contents are replaced with sector 405 in the replacement area. In this case as well, a write error occurs and sector 4
06.06.407, but all of them are verified and determined to be a write error. At this point, the host computer
The data is notified of the status of replacement processing error.

Generally, the cause of the defect on the drive side is removed and the optical disc is loaded into the optical disc device 5 again. When the replacement information of the optical disk is read from the sector 401, a sector search is performed to check whether the value of the sector pointer 306 indicating the end of the used sector of the replacement area therein is correct.

This sector search is to sequentially check whether a written sector is an unwritten sector or not, regardless of whether data has been written correctly or not.

In sector 401, the sector pointer is 403 →
Since the replacement of 405 → 406 → 407 is not communicated as replacement information, the 408th place t is shown, and the sector search above shows the 409th position, which causes a contradiction. The optical disk controller replaces the value of the sector pointer loaded into the main memory with the value obtained by the sector search and continues the subsequent processing.

FIG. 5(b) shows that a trouble occurs in the optical disk drive when replacement processing occurs, data has been replaced in the replacement area, and new replacement information including that information is written to the sector 414. FIG. 6 is a diagram illustrating a case where writing from sector 414 onwards results in an error.

When the cause of the defect on the drive side is removed, this optical disc is loaded into the optical disc device 5 again.

Replacement information is read. However, here, sector 41
6 has failed to write, so it cannot be read. In this case, the previous sector 415 is the target of reading, but since this also failed, in the end, sector 410
The contents of are loaded onto the main memory of the optical disk controller, and thereafter the same processing as in FIG. 5(a) above is performed.

[Effects of the Invention] According to the present invention, it is possible to prevent further replacement of the replacement occurring during the -degree replacement processing, and thereby it is possible to prevent the replacement area from being exhausted. .

[Brief explanation of drawings]

FIG. 1 is a blow diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing the format of the optical disc in the above embodiment. FIG. 3 is a diagram showing the format of the buffer memory for n sectors in the above embodiment. FIG. 4 is a diagram showing the format of the replacement information sector in the above embodiment. FIG. 5 is a diagram showing an example of replacement processing in the above embodiment. 101... Optical disk format, 102... Additional writing portion corresponding to buffer memory 201, 103.112.113... Replaced sector, 104.
105.106...Replacement information sector, 108.109
, 110, 111... Replacement sector, 304... Older number of replacement information sector, 305...
End address of used sector in replacement information area, 306... End address of used sector in replacement information, 307... Address of replaced sector, 308... Address of replacement sector, 309... Occurrence of replacement. Flag indicating the cause. Patent applicant Canon Co., Ltd. Agent Arata Yokubo − L-11−−−−−−−−−−−−−−−1−−−−
--------''Figure 2Figure 3 202 201:''j
t5 Sukoshi H Yuuno J11″・, 7 amemory

Claims (2)

[Claims] (1) A recursive permission means for alternately writing data in a predetermined block into physically different blocks and recursively permitting this alternate writing; and a recursive alternate writing number for limiting the number of recursive alternate writings. 1. A recording medium replacement processing device, comprising: limiting means; and; (2) The recording medium replacement processing apparatus according to claim 1, wherein the predetermined block is at least one.