KR100814588B1 - Storage medium and inforamtion storage apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information storage device that performs positioning control of a head based on correction data for correcting an error of a servo signal, while preventing an influence occurring between adjacent correction data (post codes) in a track crossing direction. It is an object of the present invention to provide a stable recording medium and an information storage device capable of stably recording and reproducing data without significantly reducing the recording capacity of the user data area by arranging correction data.

A recording medium on which correction data for correcting a positional shift of a recording or / or reproducing head caused by an error of a servo signal is recorded, wherein correction data of adjacent tracks is arranged in the track direction of the recording medium such that they are not adjacent to each other in the recording area. The offset data is recorded, and the correction data includes data for correcting the servo signals of the plurality of servo frames.

Head, servo signal, correction data, post code, servo frame

Description

Recording medium and information storage device {STORAGE MEDIUM AND INFORAMTION STORAGE APPARATUS}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a control block configuration example of an information storage device according to the present invention.

Fig. 2 is a diagram showing an arrangement example of post codes in the first embodiment of the present invention.

3 is a view of a track in a specific cylinder of the recording medium.

4 illustrates the concept of a YAW angle;

Fig. 5 is a diagram showing the positional relationship between a reproduction element and a recording element when the YAW angle is large.

Fig. 6 is a diagram showing the positional relationship between a reproduction element and a recording element when the YAW angle is small.

7 is a flowchart of a recording sequence of a recording post code.

Fig. 8 is a flowchart showing the setting process of the post code.

Fig. 9 is a diagram showing the relationship between the fluctuation of the VCM and the demodulation position.

Fig. 10 is a schematic diagram of a control part of the VCM in the information storage device of the present invention.

Fig. 11 is a diagram showing an example of arrangement of post codes in a second embodiment of the present invention.

12 is a flowchart of a recording sequence of a reproduction post code.

Fig. 13 is a diagram showing an example of arranging post codes when a YAW angle occurs in the third embodiment of the present invention.

Fig. 14 is a diagram showing an example of arranging post codes when no YAW angle is generated in the third embodiment of the present invention.

Fig. 15 is a layout view of a conventional post cord.

16 is a diagram in which fluctuations occur in following the magnetic head.

<Explanation of symbols for the main parts of the drawings>

10: recording medium

20: magnetic head (recording reproduction head)

21: recording element

22: regeneration element

30: Actuator

40: post code

41: Post code for recording

42: Post code for playback

50: servo frame

51: servo data section

52: Preamble

53: Sync Mark

54: Gray Code

55: Burst

60: user data

61: following track

62: adjacent tracks

70: area for post code

71: blank part

80: specific cylinder

90: demodulation position

91: VCM rocking

100: HDC

110: MCU

120: MCU RAM + FLASHROM

130: RDC

140: HDIC

150: DSP

160: DSP RAM

170: SVC

180: SPM

190: VCM

The present invention relates to a recording medium for performing head positioning control on the basis of correction data for correcting fluctuations in head position caused by errors in servo information recorded on a disc-shaped recording medium, and an information storage device.

In an information recording and reproducing apparatus such as a hard disk drive, recording / reproducing of data is performed by moving a recording / reproducing head to a target track on a rotating disk surface.

In particular, hard disk drives are required to reduce the track pitch of magnetic disks for the purpose of further improving the recording density. As the track pitch is reduced, the distance between the data recorded in the adjacent tracks becomes short, and as a result, a serious problem arises that an error is likely to occur if the magnetic head recording position or reading position is slightly shifted.

One of the main causes of such a shift in the recording position and the reading position of the magnetic head is that the error of the servo signal due to the high track pitch cannot be ignored. The error of the servo signal is caused by the fact that the track in which the servo information is actually recorded is separated from the ideal state at the time of recording the servo signal (Servo Track Write: STW).

That is, when performing STW, the position of the magnetic head is measured and positioned by using an external actuator or a laser ranging device which positions the arm of the internal actuator of the magnetic disk device from the outside. Is done. However, since servo information is recorded in a state in which vibration occurs in the spindle motor of the hard disk drive (HDD) in which the STW is being performed or in the mirror of the laser range finder, the servo signal has been originally recorded. And the position of the head, which is preferable, is recorded. That is, this servo signal contains the error component of the fluctuation of the magnetic head.

In addition, there is a problem that distortion of the magnetization transition occurs in the servo signal recorded as another cause. The magnetic disk surface is composed of a collection of magnetic particles, and these magnetic particles are not orderly arranged in the same size. For this reason, the boundary between the signal and the signal becomes wavy, and a large area is required for the one-bit signal. However, in order to record data at a finer area, that is, to record at a higher density, a signal and signal boundary must be straight, and high density recording with magnetic particles of the phenomenon causes a problem that the servo signal cannot be recorded clearly. . If the servo signal cannot be recorded clearly, the SN pole direction of the magnetic particles is not determined in a certain direction, and a weak magnetization portion occurs in the servo signal. For this reason, when a magnetic head reads a servo signal, it cannot read correctly, and when a magnetic head follows a track, a position shift and fluctuation generate | occur | produce.

Therefore, correction data for correcting the error of the servo signal due to the disturbance of the positional information or the magnetic defect of the magnetic disk at the time of formation of the servo signal is recorded on the magnetic disk, and the data is read based on the correction data. A technique has been proposed to accurately position magnetic heads during release and recording.

[Patent Document 1] Japanese Patent Application Laid-Open No. 03-263662

[Patent Document 2] Japanese Patent Laid-Open No. 60-117461

Patent Literature 1 proposes a technique for recording error information indicating an error of a servo signal in one or both regions before and after a servo frame on a magnetic disk so that reading is possible on track.

Specifically, in the formation of the servo signal, the positional information includes an error component due to the influence of vibration caused by the rotation of the magnetic disk or the like. For this reason, in the case of a high density track, there was a problem that the positioning error was greatly affected. Thus, error information indicating an error of the servo signal is recorded in both regions before, after, or before and after the servo frame in the minimum unit in the circumferential direction of the servo signal. Since this error information is read out by the magnetic head during on-track, it is described that the error of the servo signal can be corrected and the magnetic head can be accurately positioned with respect to the target track.

Further, Patent Document 2 records a correction signal for correcting an error of a servo signal due to a magnetic defect on the surface of a magnetic disk on a magnetic disk, and uses the correction signal to indicate an error in the position of the magnetic head in the abnormality of the servo signal. A technique for correcting based on the value and improving the lead margin by increasing the track followability of the magnetic head has been proposed.

Specifically, the original servo signal read out by the servo head is input to the servo signal reproducing circuit to become a servo signal. However, when the original servo signal has a magnetic defect, the head position signal is generated only by the servo signal obtained by the original servo signal. If you do so, position deviation will occur. Thus, the track head is recorded based on the servo signal having the positional deviation while the servo head records the correction signal on the magnetic disk. At this time, even if there is a defect in the track itself on which the correction signal is recorded, the correction signal is recorded in multiples or has parity. For this reason, the correction signal is written before the part requiring correction.

As shown in the arrangement of the post codes in FIG. 15, correction data in each track is recorded in the post code area 70 provided immediately after each servo frame, and for recording 41 and reproduction. Divided by (42), each is alternately arranged for each servo frame. At that time, post codes arranged on adjacent tracks are arranged adjacent to each other at a slight interval.

However, even when arranged at a slight interval between the post codes, the distance (track width) between adjacent tracks is reduced due to the higher recording capacity, and the space between the post codes is not afforded. FIG. 16 is a diagram in which fluctuations occur in following the magnetic head. However, as shown in FIG. 16, if there is no space between the post codes, for example, the magnetic head 20 may be caused by vibration of the apparatus or the like. There is a significant problem that some fluctuations occur, and that fluctuations cause other data to overwrite adjacent data at the time of writing the post code or, conversely, at the time of reading, they become noise and output as a read error.

In addition, the information indicating the start of the post code must be added to the post code arrangement for each post code arrangement. For this reason, if the number of post codes is increased, the recording capacity used for the post code increases, and the recording capacity of the user data area decreases by that much.

Accordingly, the present invention has been made in view of the above problems, and relates to an information storage device which performs positioning control of a head based on correction data for correcting an error of a servo signal, and includes correction data (post code) adjacent in a track crossing direction. The recording medium and the information storage device which can stably record and reproduce data stably without reducing the recording capacity of the user data area by preventing the effects occurring between The purpose is to provide.

According to the recording medium according to the present invention, in the recording medium in which the correction data for correcting the positional shift of the recording and / or reproducing head caused by the error of the servo signal recorded in the servo frame is recorded, the correction data of the adjacent tracks is recorded. Are recorded shifted in the track direction of the recording medium so as not to be adjacent to each other in the recording area, and the correction data includes data for correcting the servo signals of the plurality of servo frames. Therefore, when the read position of the head is shifted, it is possible to prevent the problem that side data affects noise or the recording position of the recording / reproducing head is shifted and overwrites other data. Further, since the correction data includes data for correcting the servo signals of the plurality of servo frames, the capacity used for the information indicating the start of the recording area of the correction data can be reduced. Therefore, it is possible to arrange the correction data in a shifted track direction with respect to the adjacent track without significantly reducing the recording capacity of the user data area in the recording medium.

According to the recording medium of the present invention, a plurality of servo frames in which the servo signal is recorded are arranged in the track direction, and the correction data are recorded at least one servo frame shifted in the track direction. Since no correction data is recorded in the servo signal frames adjacent in the radial direction, the area adjacent to the correction data can be reliably ensured as a margin.

Further, according to the information storage device according to the present invention, correction data for correcting the positional shift of the recording or / and reproducing head caused by the error of the recording or / and reproducing head and the servo signal recorded in the servo frame is recorded, The correction data of adjacent tracks are recorded shifted in the track direction of the recording medium so as not to be adjacent to each other in the recording area, and the correction data is recorded on a recording medium including data for correcting servo signals of a plurality of servo frames. And position control means for performing position control of the recording or reproducing head based on the correction data, and control means for recording or reproducing data at a position controlled by the position control means.

Therefore, it becomes possible to prevent the problem that the data when the reading position of the head is shifted affects as noise, the recording position of the recording / reproducing head is shifted, and overwrites other data. Further, since the correction data includes data for correcting the servo signals of the plurality of servo frames, the capacity used for the information indicating the start of the recording medium of the correction data can be reduced. Therefore, it is possible to arrange the correction data in a shifted track direction with respect to the adjacent track without significantly reducing the recording capacity of the user data area on the recording medium.

Further, according to the information storage device according to the present invention, since the position control means includes separation means for separating the correction data into data for correcting the servo signals of the plurality of servo frames, the head is connected to the servo frame. The time for calculating the correction amount can be secured before arrival, and the positioning of the head can be performed immediately when the head arrives at the servo frame to be corrected.

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of this invention is described, referring an accompanying drawing.

1 is a diagram showing an example of a control block configuration of an information storage device according to the present invention. In FIG. 1, a spindle motor (SPM) 180 rotates a magnetic disk. The voice coil motor (VCM) 190 drives the actuator 30 mounted with the magnetic head (recording / reproducing head) 20 shown in FIG. 4 to rotate the magnetic head 20 on the magnetic disk 10. Position on the track to be installed on. The magnetic head 20 is a recording / reproducing head, and the recording element 21 and the reproduction element 22 are formed.

The head IC (HDIC) 140 is an IC for controlling the operation of the magnetic head 20, and is a preamplifier for amplifying a read signal, a bias current source for the magnetic head 20, or a magnetic head 20 when recording data. Driver) and a function of selecting actually used for recording / reading from a plurality of magnetic heads 20 provided. This head IC 140 corresponds to head control means for controlling the electrical operation of the magnetic head 20.

The RDC 130 is a PRML lead channel IC. When reading data, the RDC 130 demodulates and decodes a data signal, which is an analog signal transmitted from the HDIC 140, based on a PRML scheme, and converts the decoded digital data into a parallel signal. . When data is recorded, the record data is encoded and modulated, and a data signal made of an analog signal is sent to the HDIC 140. This RDC 130 corresponds to data conversion means for converting data read from the magnetic disk or data recorded on the magnetic disk.

The digital signal processor (DSP) 150 performs signal processing required for constructing a servo control system that performs position control of the magnetic head 20. The servo controller (SVC) 170 performs rotational speed control of the SPM 180 and position control (seek control, track following control) of the magnetic head 20 via the VCM 190. This DSP 150 corresponds to head position control means for controlling the positioning of the magnetic head 20 on the magnetic disk on the basis of the data read out from the magnetic disk.

The hard disk controller (HDC) 100 is an IC for exchanging various commands and data between systems such as a computer, which is a host of the apparatus, and acquires an operation request for the apparatus from the host. In the present embodiment, it is assumed that three kinds of requests, namely, seek, read (reproduce) and write (write), are defined in advance in the operation request for the apparatus sent from the host.

The microcontroller unit (MCU) 110 controls the entire magnetic disk drive device. The MCU RAM + FLASHROM 120 is composed of a random access memory and a flash EEPROM, and is used as a work memory used when the MCU 110 executes control processing. It is also used as a storage device for storing control programs executed by the MCU 110, characteristic data of the magnetic head 20, and the like. The DSP-RAM 160 is a work memory in which the DSP 150 is suitably used.

Hereinafter, the arrangement of the post code in each track according to the first embodiment of the present invention will be described in detail.

Fig. 2 is a diagram showing an example of arrangement of post codes in the recording medium of the first embodiment of the present invention. Here, the post code is correction data for correcting a servo signal recorded in each servo frame. In the present invention, a plurality of post codes are recorded in one.

In Fig. 2, the post code is recorded in the storage area immediately after the servo frame servo. The servo frame Servo is radially recorded from the center of the disk toward the outer circumferential direction, and data for controlling the position of the magnetic head is recorded. In other words, a plurality of servo frames are arranged in the circumferential direction. In the storage area of the disc-shaped recording medium, the servo data can be reproduced at predetermined intervals in the circumferential direction, and partitioned for each track width in the radial direction (track crossing direction). Also, as the recording density improves, the track width tends to narrow.

As shown in Fig. 2, the post code 40 is recorded every other area in the area immediately after the servo frame servo with respect to the circumferential direction (track following direction) of the recording medium 10, For the radial direction, every other track is recorded. That is, they are recorded shifted in the circumferential direction of the recording medium so as not to be adjacent to each other. Therefore, it is arranged in a lattice shape as a whole.

By arranging the post codes 40 in a lattice manner as described above, the interval between the post codes 40 recorded next to each other in the radial direction (track crossing direction) of the recording medium 10 can be emptied at least one track or more. It is possible to increase the margin of the post code during recording and playback. For this reason, the positioning accuracy of the magnetic head 20 improves. Therefore, when the recording positioning of the magnetic head 20 is misaligned, there is a problem of overwriting other data by mistake when the recording positioning is misaligned, or a reproduction error or a reproduction error of data occurs when the reproduction positioning is misaligned. It is possible to obtain an effect of preventing the problem of throwing away.

Further, even if the area adjacent to the post code 40 in the radial direction of the magnetic disk is the blank portion 71 in which the recording state of the data is zero, no user data or the like is recorded. This is because when the data other than the post code 40 such as user data is recorded in the blank portion 71, the storage capacity used for the user data increases as a whole, but on the other hand, it is different from the conventional case where the post codes are adjacent to each other. The same problem arises that when the head position is shaken, a part of the side data becomes a noise and a read error of the post code is generated. As a result, the positioning accuracy of the magnetic head 20 is not improved, and as a result, This is because it becomes impossible to cope with densification. For this reason, the predetermined area | region is reserved as the post code area | region 70 beforehand by the area | region continuous from the outer periphery to the inner periphery of a magnetic disk.

The post code area 70 is an area where only the post code is recorded, and is a continuous area in the radial direction from the outer circumference to the inner circumference of the recording medium 10. The post code area 70 according to the present embodiment is provided adjacent to the servo frame servo.

In addition, the blank portion 71 refers to a portion where the recording state in the post code area 70 is unused (for example, the magnetization state is the erase state).

In the post code area 70 according to the present embodiment, a total of 24 bits of 16 bits for the post code and 8 bits for information indicating the start of the post code are secured.

In addition, as a condition for arranging the post codes 40 in a lattice form, it is required that individual correction data for two servo frames adjacent to each other in the track direction are recorded in the post codes 40. In addition, two servo frames corresponding to a post code are a servo frame before one of the servo frames in which this post code is recorded, and two servo frames before. The reason is that the individual post code of each servo frame is separated from the post code 40 in advance, the correction signal is calculated, and the magnetic head is directly at the point when the magnetic head arrives at the servo frame to be corrected by moving on the track. This is because positioning can be performed. For this reason, the magnetic head is always following the track while the area between the servo frames is shifted, thereby preventing the problem of unstable recording or data reading error due to fluctuation of the magnetic head.

In this embodiment, in order to arrange the post codes 40 in a lattice form, it is assumed that correction data for each of two servo frames adjacent to the track direction on the same track is recorded in one post code 40, but in another embodiment. In this case, the configuration may be such that correction data corresponding to a plurality of servo frames on three or more identical tracks is recorded in one post code 40. In this case, the arrangement of the post codes 40 does not become a lattice, and the post codes 40 are arranged alternately or alternately in a state of being separated for each of a plurality of servo frames.

As described above, in the present invention, since correction data corresponding to each of the plurality of servo frames are recorded in one post code, the capacity used for information indicating the start of the post code can be reduced. Therefore, the ratio of the post code area 70 is reduced as much as possible, the recording capacity of the user data area is not significantly reduced, and each post code can be arranged in a grid.

In addition, the present embodiment uses only the recording post code 41 for correcting the fluctuation of the magnetic head 20 at the time of data recording and allowing the recording element 21 to record data in a stable state. In addition, an increase in the storage capacity used as the post code area 70 is prevented and simplified.

Regarding the positioning of the reproducing element 22 at the time of data recording, the reproducing element 22 is always set to be the center of the track by the positioning control by the servo signal, while the recording post code 41 is the track. Since it is arranged in the center of, the recording post code 41 can be read out by the normal track following operation. Therefore, at the time of data recording, it is not necessary to position the reproducing element 22 under special control in order to read the recording post code 41, and stable data can be recorded by normal operation.

On the other hand, the positioning of the reproduction element 22 at the time of reproduction of data is based on the characteristic data of the magnetic head 20 stored in the MCU RAM + FLASHROM 120, a control program, and the like. The position control of the reproduction element 22 is executed so that the reproduction element 22 of the head can be on-tracked and read on any track on which recording has been performed.

In this embodiment, since only the recording post code 41 is provided on the medium and the reproduction post code 42 is omitted, an increase in the storage capacity used for the post code 40 can be prevented. In addition, since the recording post code 41 is disposed at the center of the track, the recording post code 41 can be read out by a normal track following operation, and stable recording can be performed without requiring special control.

In addition, similarly to the recording element 21, a read error may occur due to the positional shift of the reproduction element 22. However, error recovery is possible by repeating the read operation while changing the read retry process or the read position. As a result, the performance is degraded due to an error recovery process or the like. However, the playback post code 42 can be omitted in an apparatus that places importance on the storage capacity of the user data area.

However, in the case where the positional shift occurs in the recording element 21, there is a high possibility that the adjacent data will be overwritten, and there is a risk that the error recovery of the original data that has been overwritten will be impossible, so that the recording apparatus will perform recording. It is preferable not to omit the post cord 41. In a device that only plays back, only the playback post code 42 may be provided.

For this reason, by arranging only the recording or reproducing post code, the ratio of the post code area to the recording capacity of the entire medium is not increased, that is, the user data area is not reduced by that much, and the post code area of FIG. The recording capacity can be arranged in a grid.

3 is a schematic diagram of the arrangement of tracks in a specific cylinder 80 of a recording medium.

The servo frame 50 is read by the magnetic head 20 during the operation of the disc drive device, and controls the SPM 180 and the VCM 190 through the SVC 170 in the DSP 150 based on the read position information. As a result, rotational control of the disc-shaped recording medium 10 and position control of the magnetic head 20 mounted on the actuator on the disc-shaped recording medium 10 are performed. In addition, the position control of the magnetic head 20 includes seek control and track following control.

"Preamble" 52 in FIG. 3 is an area for following the magnetic head 20 to the frequency, phase, and amplitude of the servo waveform, and shows the start of the area in which the servo signal is recorded. "Sync Mark" 53 shows the data start position of the servo waveform. "Gray Code" 54 is information showing which head / track the position on the track corresponds to, and the track number and the like are numerically recorded at the time of STW. The information written in "Burst" 55 recognizes the relative position between the center of the track and the position where the head is currently located. In the area of "Burst" 55, detailed positional information is recorded analogously at the time of STW and written in an amplitude method or a phase method.

The servo signal of the servo frame is recorded on the disc-shaped recording medium by STW (Servo Track Write). In addition, the "Post Code" 40 is disposed behind the servo frame 50 of the servo data unit 51, and after the hard disk drive (HDD) is built in the apparatus main body, all the servo information can be corrected. Information for correcting missing position errors is recorded numerically. For example, information indicating " shift in the inner edge direction by 0.5 tracks ", specifically, " -0.5 " and &quot; + 0.5 &quot;

Since the correction data of the "Post Code" 40 is recorded after the HDD is built in the device, the waveform between the servo waveform and the waveform of the correction data of the "Post Code" 40 is not constant (it is tuned by the device, but the measurement error is still maintained. Is recorded in a state closer to the servo data than the user data. For example, in general, since the storage area between servo frames increases as the user data faces the outer edge, the user data is recorded at a high density at a high frequency. On the other hand, the servo data is recorded at a constant frequency from the outer edge to the inner edge of the disc. The correction data of the "Post Code" 40 is recorded at a constant frequency like the servo data.

Further, in another embodiment, the recording may be performed in the same manner as the user data by correspondence of hardware and firmware.

Usually, the information in the servo frame 50 is generally recorded by the STW process, and is left thereafter. This is because once the information in the servo frame 50 is destroyed, the information in the servo frame 50 cannot be restored unless the STW is performed again. STW processes are generally time consuming. Therefore, when recording the correction data of the "Post Code" 40, the user does not arrange the "Post Code" 40 in the servo frame so as not to accidentally record it in another data area in the servo frame 50. By arrange | positioning in the user data part 60 which is a memory area which records data, the problem of destroying the information in the servo frame 50 is prevented.

4 to 7 are diagrams illustrating the positional relationship between the reproduction element 21 and the recording element 22 by the YAW angle in the magnetic head 20 of the information storage device according to the present invention.

4 illustrates the concept of YAW angle. In FIG. 4, a plurality of tracks are provided on the recording medium 10. In FIG. 4, only a few tracks of the outer peripheral portion and the inner peripheral portion are shown for convenience of description. A YAW angle is generated between each track of the recording medium 10 and the magnetic head 20, respectively, and the positions of the reproduction element 21 and the recording element 22 are shifted with respect to the radial direction of the recording medium 10. Doing. For this reason, even if the reproduction element 21 is located substantially in the center of the track, the reproduction element 21 and the recording element 22 are not always in the same positional relationship.

5 is a diagram showing the positional relationship between the reproduction element and the recording element when the YAW angle is large. In FIG. 5, 40 shows a post code, 50 shows a servo frame, and 60 shows user data. When the YAW angle is large, the magnetic head 20 is inclined with respect to the circumferential direction of the track, so that the on track positions of the reproduction head 22 and the recording head 21 are shifted at the same time. At the time of recording (when writing) the user data 60, the playback element 22 is on-track at the center of the track, and the user data is at the position of the recording element 21 when the magnetic head 20 is in that state. Record (60). At the time of reading the user data 60 (Read time), the playback element 22 is on-track at the position where the user data 60 is recorded, and the user data 60 is recorded.

6 is a diagram showing the positional relationship between the reproduction element and the recording element when the YAW angle is small. In FIG. 6, 40 shows a post code, 50 shows a servo frame, and 60 shows user data. As the YAW angle is smaller, the magnetic head 20 is on-track in a state closer to parallel to the circumferential direction of the track. At the time of recording (when writing) the user data 60, the playback element 22 is on-track at the center of the track, and the user data (at the position of the recording element 21 when the magnetic head 20 is in that state). Record 60). At the time of reading the user data 60 (Read time), the playback element 22 is on-track at the recorded position of the user data 60 and the user data 60 is recorded.

As described above, since the size of the YAW angle is different between the outer edge side and the inner edge side of the disc-shaped recording medium 10, the positional relationship between the reproducing element 21 and the recording element 22 also changes.

Therefore, when the YAW angle is generated, since the reproduction element 21 at the time of recording (when writing) is located at the center of the track, the position at which data is actually recorded becomes a place deviated from the center of the track. In the case of reproducing the recorded data, the reproducing element 21 is moved to read the recorded position. When no YAW angle is generated, data is recorded on the same line as the center position of the track.

The YAW angle refers to the inclination of the magnetic head 20 on the recording medium 10 with respect to the recording medium circumferential direction (tangential direction). 4 shows a case where the magnetic head 20 is located at each of two points of the outer edge portion and the inner edge portion of the recording medium 10. As shown in FIG. As shown in FIG. 4, the inclination of the magnetic head 20 becomes a positive angle on the inner edge side and a negative angle on the outer edge side, based on the track tangent (plus tangent).

7 is a flowchart of a recording sequence of a recording post code in the first embodiment of the present invention.

First, the magnetic head 20 is seeked so that the recording element 21 is located at a place where the accuracy of positioning is to be improved (a recording position of the user data of the correction track) (S101). Since the magnetic head 20 in this embodiment is set such that the reproduction element 22 is located at the center of the track, the recording position of the user data of the recording element 21 may have been recorded at the center of the track. It is determined based on the state of the YAW angle of the reproduction element 22 and the recording element 21 at the time. Using the playback element 22, the N-circuit measurement is performed to determine how much error occurs between the position information in the servo signal recorded at the time of STW and the center position of the track, using the center of the track as the target position. , Based on the measurement result, position correction information is generated (S102).

Next, in the state where the recording element 21 is located at a place where the accuracy of positioning is to be improved (a recording position of user data), the position correction is performed at a place where the position correction information can be naturally read from the reproduction element 22. Since the information is recorded as the post code 40, the magnetic head is seeked (S103). In other words, the recording of the user data in this embodiment is performed while the reproducing element 22 of the magnetic head is located at the center of the track, so that the seek operation is performed so that the recording element 21 is located at the center of the measured track. The post code 40 can be recorded at the track center position. Here, in the state where the recording element 21 is at the center of the track, it is selected whether or not to correct the correction position information again (S104). When the position correction information is not measured again, the post code 40 is recorded (S107) in the post code area of the track where the recording element 21 is located.

On the other hand, when the correction position information is measured again while the recording element 21 is at the center of the track (when the accuracy of positioning of the recording element 21 is improved even when the post code 40 is recorded), the track Position correction information is generated from the measurement of the M rounds to bring the center position of the closer to the shape closer to the circle (S105). In order to improve the rotational run out (RRO), which is a constant fluctuation which occurs repeatedly in the same cycle by giving one rotation of the disk, that is, to improve the positioning accuracy of the magnetic head 20, the position correction information obtained therefrom is added to the servo control. Reflect it (S106). Then, the post code 40 is recorded (S107) in the post code area of the track where the recording element 21 is located.

The control regarding the writing of the post code in the embodiment according to the present invention is based on the recording pattern stored in the MCU RAM + FLASHROM 120 and the DSP 150 via the SVC 170 to the SPM 180, By controlling the VCM 190, the rotation control of the disc shaped recording medium 10 and the positioning of the magnetic head 20 mounted on the actuator on the disc shaped recording medium 10 are performed.

As for the post code to be recorded, the data signal modulated by the RDC 130 is sent to the HDIC 140, and the DSP 150 records the position where the magnetic head 20 is positioned.

Here, the recording pattern of the post code will be described. For example, in the [2n-1] th (odd) track, when the post code is placed in the area corresponding to the servo number [2m-2] (even number), the [2n] th (even) number is used. The area in which the post code is placed in the track corresponds to the servo number [2 m-1] (odd number).

On the contrary, in a track of the [2n-1] th (odd number), when the post code is placed in the area corresponding to the servo number [2m-1] (odd number), the [2n] th (even number) The area in which the post code is arranged in the track of Fig. 3) corresponds to a servo number [2m] (even number).

When the post code recording pattern is shifted every three servo frames, for example, in the [3n-2] th track, the post code is arranged in an area corresponding to the servo number [3m-3]. In this case, the area for arranging the post code in the track [3n-1] corresponds to the servo number [3m-2], and the area for arranging the post code in the [3n] track is servo ( servo) number [3m-1].

If the post code is placed in the area corresponding to the servo number [3m-3] in the [3n-2] th track from the other side, the post code in the [3n-1] th track is set. The area to arrange corresponds to the servo number [3m-2], and the area to arrange the post code in the [3n] th track corresponds to the servo number [3 m-1].

If the post code is placed in the area corresponding to the servo number [3m-3] in the [3n-2] th track from the other side, the post code in the [3n-1] th track is set. The area for arranging corresponds to servo number [3 m-2], and the area for arranging post code in the [3n] th track corresponds to the servo number [3 m-1].

If the post code recording pattern increases and shifts for each of the plurality of servo frames, the recording pattern also changes after that.

In addition, it is set as (n = 1, 2, ..., x, m = 1, 2, ..., y), and x and y are arbitrary values because they differ with a medium.

In the embodiment according to the present invention, the post codes 40 are arranged in a lattice form, but in other embodiments, the servo data portion 51 for recording the post codes 40 is not particularly limited, and any servo data portion ( 51, but the place where the post code 40 should be recorded is one area ahead of the area between the measured servo frames 50 of the position correction information, or two areas ahead thereof, as will be described later. Since the correction data can be processed in advance before the position is given to and processed, high-speed positioning becomes possible, and a better effect can be obtained.

Hereinafter, the position correction control based on the post code 40 processed by the information recording and reproducing apparatus according to the present invention will be described in detail.

8 is a flowchart showing the post code setting processing in the servo frame number [N]. In the storage area of the RAM for storing the post code, an array A [] for storing correction data of the post code 40 for one week and a variable B for storing the post code used in the two preceding servo frames are provided. have.

First, the control current flowing through the VCM 190 is calculated using the correction value Rn set to the servo frame number [N-1] one preceding the servo frame number [N] (S201). Next, it is determined whether or not the servo frame number [N] corresponds to the track to be corrected with the post code 40 (S202), and the servo frame number [N] is assigned to the track to be corrected with the post code 40. If not, the correction value Rn is set to zero and correction is not performed (S203). On the other hand, when the servo frame number [N] corresponds to the track to be corrected by the post code 40, it is determined whether or not the post code 40 is in the servo frame number [N] (S204), and the servo frame If the post code 40 is not included in the number [N], the post code stored in the variable B in the servo frame number [N-1] is set to the correction value Rn (S205). In this case, the servo frame number [N-1] has a post code 40, and the post code 40 is divided into a servo frame number [N] and a servo frame number [N + 1]. do. Since the post code stored in the variable B is a post code used for the servo frame number [N + 1], the magnetic head will shift to the servo frame number [N + 1] after being separated into the post codes of the two servo frames. At that time, the post code stored in the variable B is set to the correction value Rn.

On the other hand, when the post code 40 is present in the servo frame number [N], the post code 40 of the two preceding servo frame numbers [N-2] is divided into two individual post codes, and the variable B The position correction of the magnetic head 20 at the servo frame number [N] is performed by the post code stored in the. Then, the correction value Rn in the servo frame number [N + 1] to which the magnetic head 20 shifts next and the servo frame number [N + 2] to be shifted next is arranged in the servo frame number [N]. Since it is set based on the post code 40, it is determined whether or not the post code 40 in the servo frame number [N] can be obtained correctly (S206).

If the post code 40 in the servo frame number [N] cannot be obtained correctly, the past post code in which the post code 40 is stored in the readout arrangement A [] before performing position correction on this track. In step S207, it is determined whether or not this post code 40 which could not be read correctly from 40 can be corrected. If it cannot be corrected, the correction value Rn is set to zero and correction is not performed (S203). On the other hand, in the case where correction is possible, the post code used for the servo frame number [N + 1] and the servo frame number [N + 2] is calculated from the stored value A [] which is the past post code 40 (S208). . The post code used for the servo frame number [N + 1] is set to the correction value Rn, and the post code used for the servo frame number [N + 2] is stored in the variable B (S210).

When the post code 40 in the servo frame number [N] can be obtained correctly, the post code and servo frame number [N +] using the read position correction information as the servo frame number [N + 1]. 2] It is divided into post codes used in [2] and stored in the array A []. Since a lot of time is required for the separation processing here, the post codes for two servo frames are recorded in one post code, and the post codes after the separation are used for the one servo frame in front and the two servo frames in front. This makes it possible to correct the position of the magnetic head 20 as soon as the magnetic head arrives at the servo frame to be corrected. Then, after separating into the post code of each servo frame, set the post code used as the servo frame number [N + 1] to the correction value Rn, and use the post code used as the servo frame number [N + 2]. The variable B is stored (S210).

As described above, since the set post code 40 is used after the next servo frame in the area where the post code 40 is placed, the position is corrected as soon as the magnetic head 20 arrives at the servo frame to be corrected. The post code 40 is not limited only to being arranged immediately after the servo frame as long as the condition of being able to be satisfied. Although the post size 40 of the embodiment which concerns on this invention is arrange | positioned immediately after each servo frame, in another embodiment, the structure arrange | positioned in areas other than immediately after a servo frame may be sufficient.

9 is a diagram showing the relationship between the shaking of the VCM and the demodulation position.

In FIG. 9, 90 shows the demodulation position (trajectory of the ideal magnetic head), and 91 shows the fluctuation of the VCM (the swing trajectory of the actual magnetic head).

In order to record data on the recording medium 10 with high density, it is ideal that the center of the track is close to a circle, and each track is arranged concentrically (broken line in FIG. 9). However, there is a certain fluctuation called RRO (Rotational Run Out) at the center of the actual track (solid line in Fig. 9).

Fig. 10 is a control block diagram showing an outline of the control of the VCM at the time of correcting the position of the magnetic head using the separated post code.

In Fig. 10, the deviation (position error) between the target position (center position of the track in this embodiment) and the actual magnetic head position is obtained, and the difference between the correction value Rn is obtained from the obtained deviation. Here, the individual post code separated from the post code 40 is provided to the correction value Rn. In the controller filter C, the positive control current to be corrected is calculated, and the position correction of the magnetic head 20 is performed in the voice coil motor filter P. FIG. Then, the magnetic head position after the correction is fed back to determine the deviation of the target position (center position of the track). The VCM is controlled by obtaining a control current with this deviation as zero.

The demodulated position information is information in which a certain filter characteristic is included in the RRO, and is called a rotational position error (RPE). When generating the post code, this RPE is measured to obtain the RRO using the inverse characteristic of the sensitivity function.

Here, a method of obtaining the RRO will be described. The transfer function (sensitivity function) from RRO to RPE is

[Equation 1]

In order to find RRO from RPE, multiply the inverse characteristic (1 + PC). The RPE generated from the RRO can be reduced by correcting the target position using the RRO obtained above and making the target position closer to a round shape.

As described above, in the embodiment according to the present invention, since the post cords 40 are arranged in a lattice shift, and the post cords arranged adjacent to each other in the radial direction of the recording medium 10 are spaced apart, When the post code is read, a read error caused by reading the post codes of one to several tracks as noise and the problem of overwriting the adjacent post code when the post code is recorded can be prevented. Can be reproduced with high accuracy. In addition, in the embodiment according to the present invention, since the post code 40 is composed of only the recording post code 41, the post code 40 is arranged next to the recording medium 10 in the radial direction without reducing the storage capacity of the user data area. It is possible to secure an area for spaced post codes.

Next, a second embodiment according to the present invention will be described.

Hereinafter, the description of the parts having the same configuration as in the first embodiment will be omitted.

FIG. 11 is a diagram showing an example of arrangement of post codes in each track of a recording medium in the second embodiment of the present invention. In Fig. 11, the post code 41 shows a recording post code and 42 shows a post code for reproduction, respectively, which are arranged in different storage areas immediately after the servo frame servo. The servo frame is recorded radially from the center of the disk, and data for controlling the position of the magnetic head is recorded. As for the storage area of the disc-shaped recording medium, the servo data can be reproduced at predetermined intervals in the circumferential direction, and is divided for each track width in the radial direction. In addition, as the recording density improves, the track width tends to narrow.

As shown in FIG. 11, the post code of this embodiment alternately arranges post code areas dedicated to the recording post code 41 and post code areas dedicated to the reproduction post code 42 for each servo frame, and is odd. Each post code of the second (or even) track is shifted forward or backward with respect to the circumferential (track following) direction. Therefore, the post code of this embodiment is arranged in the post code area 70 such that the arrangement of the post code is tracked back and forth by the data capacity of the post code.

In this way, in the adjacent tracks, the arrangement of the post codes is circulated in the circumferential direction by the data capacity of the post codes so that they are not adjacent to each other, so that the magnetic head 20 cannot read a part of the adjacent post codes. The magnetic head 20 is disposed so that it cannot overwrite adjacent post codes. For this reason, a read error of a post code can be prevented and the positioning accuracy of the magnetic head 20 improves. Therefore, when the recording position of the magnetic head 20 is shifted, there is a problem of accidentally overwriting other data with respect to the side data, or a problem of data reproduction miss or reproduction error when the reproduction position is shifted. Etc. can be prevented.

In the area adjacent to the post code in the radial direction of the magnetic disk, even if the data recording state is zero blank portion 71, no user data or the like is recorded. When the data other than the post code such as user data is recorded in the blank portion 71, the storage capacity is slightly increased by that amount, but the head position, which is the same problem as in the conventional case in which the post codes are adjacent to each other, may be shaken. At this time, a problem arises in that a part of the side data becomes a noise and a read error occurs in the post code. This is because the accuracy of positioning the magnetic head 20 does not improve, and as a result, the density of the recording medium cannot be coped with. For this reason, a predetermined area is secured as the post code area 70 from the outer edge to the inner edge of the magnetic disk in advance.

The post code area 70 requires a total of 48 bits for a single post code because a total of 24 bits of 16 bits and 8 bits are required for information indicating the start of the post code for correction data.

In the present invention, common to each embodiment, one post code includes correction data of individual post codes for two servo frames adjacent in the track direction on the same track. In addition, the two servo frames corresponding to each post code are the servo frame before one of the servo frames in which this post code is arrange | positioned, and the servo frame before two. The reason for this is that the individual post code of each servo frame is separated from the post code in advance, the correction signal is calculated, and the position of the magnetic head immediately after the magnetic head 20 arrives at the servo frame to be corrected by moving on the track. This is because the decision can be made. For this reason, the magnetic head 20 is always in the state of following the track while the area between the servo frames is shifted, and the problem of unstable recording of data or reading of data due to fluctuation of the magnetic head 20 is prevented. do. In addition, since the correction data can be processed in advance in the rotation waiting step before positioning the target servo frame, the above configuration enables high-speed positioning.

Although common to each embodiment of the present invention, an example in which one post code includes correction data of individual post codes for two servo frames adjacent to a track direction on the same track, in another embodiment, a plurality of post codes are included in one post code. The configuration may include correction data of individual post codes. In this case, the arrangement of the post code is not changed between the recording post code 41 and the reproduction post code 42 for each servo frame, and the recording post code 41 and the reproduction post code 42 are not changed. There exists an area between servo frames that are not arranged anywhere.

In addition, since the corresponding correction data of the plurality of servo frames are recorded in one post code, the capacity to be used for information indicating the start of the post code can be reduced, and the post code area of the entire recording medium can be reduced. It is possible to arrange the post codes in a lattice form without significantly increasing the ratio of the recording capacity.

In addition, when the correction data of three or more post codes are placed in the post code area between the servo frames, the blank portion of the post code area only increases, and the recording capacity of the user data area decreases, thus recording capacity of the user data area. This arrangement may be used for products that do not pursue this.

12 is a flowchart of a recording sequence of a reproduction post code in the second embodiment of the present invention.

First, the magnetic head 20 is seeked so that the reproduction element 22 is positioned at a place where the accuracy of positioning is to be improved (a user data read position of a correction track) (S111). Then, reading is performed while changing the reading position, measurement of the correction information is performed N times, and position correction information is generated based on this specific result (S112). Next, when the reproducing element 22 reads the user data, the post code is placed in the position correction information (on the track on which the user data is recorded) where the reproducing post code 42 can also be read by the normal read operation. The magnetic head is seeked because the recording is performed as (S113). It is assumed here that the recording element 21 is seeked on the track on which user data is recorded. Since the magnetic head in this embodiment is set such that the playback element 22 is located at the track center, the user data is recorded in the state where the playback element 22 is located at the track center. It may be seeked so that the regeneration element 22 is positioned.

Next, in the state where the recording element 2 is on the track on which the user data is recorded, it is selected whether or not to measure the correction position information again (S114). If the position correction information is not measured again, the recording post code 42 is terminated at the place where the recording element 21 is located (S117). In this case, the position correction may be performed using the result measured at the time of recording the recording post code 41 shown in FIG. 7 as it is.

On the other hand, in the state where the recording element 21 is on the track on which the user data is recorded, when the correction position information is measured again, that is, when the recording post code 42 is recorded, the positioning of the recording element 21 is determined. In the case of improving the accuracy of, the position correction information is generated from the measurement of the M rounds (S115), and the measurement result is reflected in the servo control in order to improve the positioning accuracy of the magnetic head 20 (S116). Then, the recording post code 42 is terminated at the place where the position correction where the recording element 21 is located is performed (S117).

As described above, in the embodiment according to the present invention, in the adjacent tracks, the arrangement of the post cords is moved back and forth with respect to the circumferential (track length) direction to blank the areas of the adjacent portions, and the magnetic head 20 The arrangement is made so that a part cannot be read out, and the magnetic head 20 is arranged so as not to overwrite an adjacent post code, so that when the magnetic head reads the post code, the post code of the next track is read out as noise. When a read error or a post code is recorded, the problem of overwriting an adjacent post code can be prevented, and the post code can be reproduced with high precision. In addition, in the embodiment according to the present invention, since the recording post code 41 and the reproduction post code 42 are recorded in the post code area 70, a high precision magnetic head not only during data recording but also during data reproduction. Positioning becomes possible.

Next, a third embodiment according to the present invention will be described.

Hereinafter, the description of the parts having the same configurations as the first and second embodiments will be omitted.

FIG. 13 is a diagram showing an arrangement example of post codes in respective tracks of a recording medium in the second embodiment of the present invention. In Fig. 13, the post code 41 shows a recording post code and 42 shows a post code for reproduction, respectively, which are arranged in different storage areas immediately after the servo frame servo. The servo frame is recorded radially from the center of the disk, and data for controlling the position of the magnetic head is recorded. In the storage area of the disc-shaped recording medium, the servo data can be reproduced at predetermined intervals in the circumferential direction, and partitioned for each track width in the radial direction. Also, as the recording density improves, the track width tends to narrow.

As shown in FIG. 13, in the present embodiment, the reproduction post code 42 is disposed in the post code area 70 in succession to the recording post code 41. As shown in FIG. That is, in the series of servo data sections 51, the recording post code 41 and the reproduction post code 42 are arranged as one combination. A reproduction post code 42 for correcting the reading position of the user data is added after the recording post codes 41 arranged in a grid as shown in FIG. 2, and the positioning accuracy of the magnetic head at the time of reading data is added. The improvement is also aimed at.

FIG. 14 is a diagram showing an example of arranging post codes in a case where a YAW angle of a recording medium does not occur in the third embodiment of the present invention. Since each structure of FIG. 14 is the same as that of FIG. 13, description is abbreviate | omitted.

In FIG. 13, the recording post code 41 and the reproduction post code 42 are arranged to be offset from each other in the radial direction of the recording medium. In FIG. 14, the recording post code 41 and the reproduction post code 42 Are arranged side by side with respect to the circumferential (track length) direction of the recording medium. In this way, the recording post position 42 on the track varies depending on the degree of the YAW angle.

13 and 14, a few bits of blanks are provided between the recording post code 41 and the reproduction post code 42. In another embodiment, a continuous configuration without blanks may be used, and a large blank is also provided. May be installed configuration.

As described above, in the present embodiment, since the reproduction post code 42 for correcting the read position of the user data is arranged behind the recording post code 41, a high precision magnetic head not only during data recording but also during data reproduction. The position of the reproducing post code is YAW with respect to the recording post code. Therefore, when the data is read, the magnetic head is moved to the reproducing operation as it is without seeking again to the start position of the data. It is possible to perform a quick and stable regeneration operation.

Further, in the area adjacent to the post code 40 in the radial direction of the magnetic disk, even if the recording state of the data is zero blank portion 71, recording of the user data or the like is not performed. When the data other than the post code 40 such as user data is recorded in the blank portion 71, the storage capacity used for the user data increases as a whole, but on the other hand, the same problem as in the conventional case where the post codes are adjacent to each other is caused. When the head position is shaken, a part of the side data becomes a noise and a read error occurs in the post code, and the accuracy of positioning of the magnetic head 20 is not improved, resulting in higher density of the recording medium. This is because it becomes impossible to cope. For this reason, a predetermined area is secured as the post code area 70 from the outer edge to the inner edge of the magnetic disk in advance.

In the post code area 70, a total of 48 bits are required because one post code requires a total of 24 bits of 16 bits and 8 bits of information indicating the start of the post code for correction data.

In this embodiment, correction data of individual post codes of two servo frames adjacent to each other in the track direction on the same track is recorded in one post code. In addition, the two servo frames corresponding to each post code are the servo frame before one of the servo frames in which this post code is arrange | positioned, and the servo frame before two. The reason for this is that the individual post code of each servo frame is separated from the post code in advance, the correction signal is calculated, and the position of the magnetic head immediately after the magnetic head 20 arrives at the servo frame to be corrected by moving on the track. This is because the decision can be made. For this reason, the magnetic head 20 is always in the state of following the track while the area between the servo frames is shifted, and the problem of unstable recording of data or reading of data due to fluctuation of the magnetic head 20 is prevented. do. In addition, the above configuration enables high-speed positioning.

As described above, in the present embodiment, since one post code 40 includes correction data of individual post codes for two servo frames adjacent to the track direction on the same track and is recorded in a grid, the user data area is stored. It is possible not to reduce the capacity as much as possible, and to secure an area for spacing with the post cord disposed at least next to the radial direction (track crossing direction) of the recording medium. In another embodiment, the configuration may include one post code 40 including correction data of post codes corresponding to three or more servo frames. In this case, the post codes 40 are arranged alternately or alternately in a state in which the post codes are arranged in a plurality of servo frames.

In addition, in the present embodiment, the post code 42 for reproducing is disposed in the post code area 70 in succession to the recording post code 41, but in another embodiment, the post code area in the post code area 70 is reversed. In 70, the recording post code 41 may be disposed in succession to the reproduction post code 42.

As described above, in the present embodiment, since correction data of corresponding post codes of the plurality of servo frames are recorded in one post code, the capacity used for the information indicating the start of the post code can be reduced as much as the combined amount. have.

As described above, in this embodiment, since the reproduction post code 42 for correcting the read position of the user data is arranged after the recording post codes 41 arranged in a grid, the magnetic head reads the post codes. When outputting, it is possible to prevent a reading error caused by reading the post code of the next track as noise and a problem of overwriting the adjacent post code when recording the post code. It becomes possible.

In addition, in the present embodiment, since the reproducing post code 42 for correcting the read position of the user data is arranged behind the post code 41 for recording, a high precision magnetic head is not only used for data recording but also for data reproduction. The positioning post is possible, and since the reproduction post code has a YAW angle with respect to the recording post code, the magnetic head can be moved to the reproduction operation as it is, without reading again to the start position of data during data reading. It is possible to perform a fast and stable regeneration operation.

As in the second and third embodiments, at least one servo frame or more is disposed while two post codes 41 and 42 for recording and reproduction used for correcting the same servo frame are arranged side by side in the track direction in the post code area. Since the post codes for recording and reproducing the side tracks are arranged in a lattice shape, the post code area 70 is about twice as wide as the first embodiment, and the recording capacity of the user data area is that much. Although it is reduced, it is stopped at the recording capacity of the lowest required post code area, and the positioning of the recording and reproducing head can be realized at high speed with high accuracy.

As shown in the figure, as the post code area 70, the area continuous in the radial direction is secured from the outer circumference to the inner circumference of the recording medium 10, so that the cross erase and cross talk of the post codes between adjacent tracks. Etc., and the arrangement of the user data area does not change much as conventionally, and it does not need to be complicated.

In addition, this invention is not limited to the Example shown to the said description and drawing, It can change and implement suitably in the range which does not change the summary.

(Appendix 1) A recording medium in which correction data for correcting recording or / or positional shift of a reproduction head caused by an error of a servo signal recorded in a servo frame is recorded, wherein the correction data of adjacent tracks is recorded in the recording medium. The recording medium is shifted in the track direction of the recording medium so as not to be adjacent to each other in the area, and the correction data includes data for correcting the servo signals of the plurality of servo frames.

(Supplementary Note 2) In the recording medium according to Supplementary Note 1, a plurality of servo frames in which the servo signal is recorded are arranged in a track direction, and the correction data is used to correct a servo signal of a servo frame arranged forward in the track direction. And recording data.

(Supplementary Note 3) The recording medium according to Supplementary Note 2, wherein the correction data is recorded by shifting at least one servo frame or more in a track direction.

(Supplementary Note 4) The recording medium according to Supplementary Note 3, wherein the correction data includes data for correcting servo signals of at least two servo frames in front of the track direction.

(Supplementary Note 5) The recording medium according to Supplementary Note 4, wherein the correction data is recorded in a correction area provided between servo frames.

(Supplementary Note 6) The recording medium according to Supplementary Note 5, wherein the correction area is an area continuous in the radial direction from the outer circumference to the inner circumference of the recording medium.

(Supplementary Note 7) The recording medium according to Supplementary Note 5, wherein the correction area is provided adjacent to the servo frame.

(Supplementary Note 8) In the recording medium according to Supplementary Note 1, the correction data includes recording correction data for controlling the position of the recording head at the time of recording and / or reproduction correction data for controlling the position of the reproduction head at the time of reading. And a recording medium.

(Supplementary Note 9) The recording medium according to Supplementary Note 8, wherein the recording correction data and the reproduction correction data are recorded in different correction areas, respectively.

(Supplementary Note 10) The recording medium according to Supplementary Note 8, wherein the recording correction data and the reproduction correction data are recorded side by side in the track direction in the same correction area.

(Appendix 11) Correction data for correcting the positional shift of the recording or / and reproducing head caused by the error of the recording or / and reproducing head and the servo signal recorded in the servo frame is recorded, and the correction data of the adjacent tracks is recorded. Are recorded shifted in the track direction of the recording medium so as not to be adjacent to each other in the recording area, and the correction data is included in the correction data for the recording medium including data for correcting the servo signals of the plurality of servo frames. And position control means for performing position control of the recording or reproducing head on the basis of the position and control means for recording or reproducing data at the position controlled by the position control means.

(Supplementary note 12) In the information storage device according to supplementary note 11, a plurality of servo frames in which the servo signal is recorded are arranged in a track direction, and the correction data corrects a servo signal of a servo frame arranged forward in the track direction. An information storage device, characterized in that the data to be.

(Supplementary Note 13) In the information storage device according to Supplementary Note 11, a plurality of servo frames in which the servo signals are recorded are arranged in a track direction, and the correction data are recorded by shifting at least one servo frame in the track direction. The information storage device according to claim 3.

(Supplementary Note 14) The information storage device according to Supplementary Note 11, wherein the correction data includes data for correcting servo signals of at least two servo frames in the front of the track direction.

(Supplementary Note 15) The information storage apparatus according to Supplementary Note 13, wherein the position control means includes separating means for separating the correction data into data for correcting the servo signal of each servo frame. .

(Supplementary Note 16) The information storage apparatus according to Supplementary Note 15, wherein the position control means controls the operation of the recording and / or reproducing head from data for correcting the servo signals of the individual servo frames separated by the separating means. And information calculating means for calculating a control value for the information storage device.

(Supplementary Note 17) The information storage device according to Appendix 11, wherein the correction data is recorded in a correction area provided between servo frames.

(Supplementary Note 18) The information storage apparatus according to Supplementary Note 11, wherein the correction data is recorded correction data for controlling the position of the recording head at the time of recording and / or reproduction correction for controlling the position of the reproduction head at the time of reading. An information storage device comprising data.

(Supplementary note 19) The information storage device according to supplementary note 18, wherein the recording correction data and the reproduction correction data are recorded in different correction areas.

(Supplementary note 20) The information storage device according to supplementary note 19, wherein the recording correction data and the reproduction correction data are recorded side by side in the same correction area.

As described above, the present invention relates to an information storage device which performs positioning control of a head based on correction data for correcting an error of a servo signal. It is possible to provide an information storage device capable of recording and reproducing data on a recording medium.

The present invention relates to an information storage device which performs positioning control of a head based on correction data for correcting an error of a servo signal. When recording correction data, another data is overwritten in adjacent correction data in the track direction. On the contrary, when reading, the effect of the correction data is prevented from occurring between adjacent correction data, which is a noise and output as a read error, and the arrangement of correction data does not significantly reduce the recording capacity of the user data area. It is possible to provide a recording medium which is stably recordable and reliable, and an information storage device capable of recording and reproducing data on the recording medium.

In addition, the present invention is particularly effective in an information storage apparatus using a high density recording medium having a narrow track pitch, and cross-raise or crosstalk between correction data accompanying narrow track pitches by separating the correction data in adjacent tracks. It is possible to record and reproduce the correction data with high accuracy by preventing the back and the like, and high-precision head positioning is possible at high speed.

Claims (5)

A recording medium in which correction data for correcting a positional shift of a recording and / or reproducing head caused by an error of a servo signal recorded in a servo frame is recorded. The correction data of adjacent tracks are recorded shifted in the track direction of the recording medium so as not to be adjacent to each other, At least one track is spaced apart from the correction data in the track crossing direction of the recording medium, And said correction data comprises data for correcting servo signals of a plurality of servo frames. The method of claim 1, And a plurality of servo frames in which the servo signal is recorded are arranged in a track direction, and the correction data is recorded by shifting at least one servo frame or more in a track direction. Recording or / and playback heads, Correction data for correcting the positional shift of the recording or reproducing head caused by the error of the servo signal recorded in the servo frame is recorded, and the correction data of adjacent tracks are shifted in the track direction of the recording medium such that they are not adjacent to each other. For a recording medium which is recorded, the interval of the correction data is emptied at least one track or more in the track crossing direction of the recording medium, and the correction data includes data for correcting the servo signals of the plurality of servo frames. Position control means for performing position control of the recording or / or reproducing head based on the correction data; Control means for recording and / or reproducing data at a position controlled by the position control means Information storage device comprising a. The method of claim 3, The servo frame in which the servo signal is recorded is arranged in plural in the track direction, And the correction data are recorded by shifting at least one servo frame or more in a track direction. The method of claim 4, wherein And the position control means includes separating means for separating the correction data into data for correcting the servo signal of each servo frame.

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