JP2008159125A - Magnetic disk, magnetic disk device and tracking control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic disk device capable of improving the positioning accuracy of a magnetic head and remarkably reducing the read and write errors of data. <P>SOLUTION: The magnetic disk device comprises a magnetic disk provided with a magnetic pattern S4 in a prescribed section inside a data sector SD and a magnetic head 1. The magnetic disk device acquires track position information indicating the position passing through the center axis SSax of a servo sector SS by reading the servo sector SS included in a prescribed track T while the magnetic disk is rotated, acquires track position correction information indicating the position passing through the center axis SDax of a data sector SD by reading the magnetic pattern S4 thereafter, and makes the magnetic head 1 follow the prescribed track T while correcting the position of the magnetic head 1 for each data sector SD on the basis of the track position information and the track position correction information. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic disk, a magnetic disk device, and a tracking control method suitable for so-called discrete track media and patterned media.

  In the technical field of magnetic disks, magnetic disks such as discrete track media (DTM) and patterned media (PM) are known as preferred media for achieving high recording density. This type of magnetic disk is described, for example, in Patent Document 1 below.

  The magnetic disk described in Patent Document 1 has a structure in which adjacent tracks are physically separated by nonmagnetic materials or grooves, and these tracks are subdivided into sectors. Each sector is provided with a servo sector (servo area) used for tracking control and a data sector (data area) for magnetically recording data adjacent to the servo sector. A continuous magnetic area is provided between the servo sector and the data sector for recording positioning correction information regarding the magnetic head as magnetic data.

  A magnetic head is incorporated in a magnetic disk device having such a magnetic disk. The magnetic head can be moved in a substantially radial direction of the magnetic disk via a swing arm, a voice coil motor, or the like. The magnetic head includes a read head (read head) and a write head (write head). Are provided independently of each other.

  In such a magnetic disk apparatus, the profile of each track should ideally be a perfect circle, but the track position in the disk radial direction is determined for each servo sector (actual profile). . For this reason, in the magnetic disk device, the offset amount of the actual profile with respect to the perfect circular profile is previously written in the continuous magnetic area of each sector as positioning correction information. At the time of tracking control, the positioning correction information written in the continuous magnetic region is read, and the magnetic head is caused to follow the target track while correcting the position of the magnetic head for each sector based on this. According to such a tracking control method, it is possible to cause the magnetic head to substantially follow the target track based on the positioning correction information.

JP 2006-31846 A

  However, in the conventional tracking control method as described above, the position in the disk radial direction of the data sector, which is actually a portion for magnetically recording data, is not acquired at all. For example, there is a slight misalignment between the servo sector and the data sector. If there is, a slight shift occurs between the magnetic head and the data sector. That is, in the conventional tracking control method, the positioning accuracy of the magnetic head with respect to the data sector cannot be increased so much, and the data read / write error is not particularly reduced.

  The present invention has been conceived under the circumstances described above, and can improve the positioning accuracy of a magnetic head with respect to a data sector, and thus can greatly reduce data read / write errors. An object of the present invention is to provide a magnetic disk device and a tracking control method.

  In order to solve the above problems, the present invention takes the following technical means.

  In the magnetic disk provided by the first aspect of the present invention, adjacent tracks are physically separated by a nonmagnetic material or a groove, and these tracks are subdivided into sectors. Each of them is a magnetic disk having a structure in which a servo sector used for tracking control and a data sector for magnetically recording data are provided adjacent to the servo sector. A magnetic pattern comprising an array of magnetic regions and nonmagnetic regions is provided.

  Preferably, a data zone in which data can be substantially magnetically recorded is provided adjacent to the magnetic pattern in the data sector.

  Preferably, the servo sector includes a servo burst pattern for tracking control, and a part of the servo burst pattern is formed so as to be shifted on both sides of the data sector, while constituting the magnetic pattern. The magnetic region is formed so as to be aligned with the data zone.

  In the magnetic disk device provided by the second aspect of the present invention, adjacent tracks are physically separated by a non-magnetic material or a groove, and these tracks are subdivided into sectors. Each has a structure in which a servo sector used for tracking control and a data sector for magnetically recording data are provided adjacent to the servo sector, and a predetermined section in the data sector has a magnetic sector. A magnetic disk provided with a magnetic pattern comprising an array of areas and non-magnetic areas, a magnetic head for reading / writing data from / to the magnetic disk, a rotation driving means for rotating the magnetic disk, and the magnetic head A magnetic disk device comprising head moving means for moving the magnetic disk in a substantially radial direction. Track position information acquisition means for acquiring the track position information indicating the position passing through the central axis of the servo sector by reading the servo sector included in the predetermined track via the magnetic head during the rotation of the magnetic disk; Track position correction for acquiring track position correction information indicating a position passing through the central axis of the data sector by reading the magnetic pattern included in the predetermined track through the magnetic head during rotation of the magnetic disk Tracking control that performs tracking control so that the magnetic head follows the predetermined track while correcting the position of the magnetic head for each data sector based on the information acquisition means and the track position information and track position correction information Characterized by comprising means That.

  Preferably, the magnetic head is provided with a read head unit and a write head unit for independently reading and writing data, and after obtaining the track position information and the track position correction information, the tracking control means Magnetic recording marking means for applying a predetermined magnetic recording mark to a magnetic region constituting the magnetic pattern via the write head unit while performing tracking control, and after applying the predetermined magnetic recording mark, the magnetic disk Read / write head offset information acquisition means for acquiring read / write head offset information indicating a position passing through the central axis of the magnetic recording mark by reading the predetermined magnetic recording mark via the reading head unit during rotation of And the tracking control means includes a predetermined data When magnetically recording data on a sector, based on the track position correction information and read-write head offset information, is configured to correct the position of the write head portion with respect to the predetermined data sector.

  In the tracking control method provided by the third aspect of the present invention, adjacent tracks are physically separated by a nonmagnetic material or a groove, and these tracks are subdivided into sectors. Each has a structure in which a servo sector used for tracking control and a data sector for magnetically recording data are provided adjacent to the servo sector, and a predetermined section in the data sector has a magnetic sector. A magnetic disk provided with a magnetic pattern comprising an array of areas and non-magnetic areas, a magnetic head for reading / writing data from / to the magnetic disk, a rotation driving means for rotating the magnetic disk, and the magnetic head Tracking control using head moving means for moving the magnetic disk in a substantially radial direction. A tracking control method for acquiring track position information indicating a position passing through the central axis of the servo sector by reading the servo sector included in a predetermined track via the magnetic head while the magnetic disk is rotating. Track position information acquisition step, and during the rotation of the magnetic disk, by reading the magnetic pattern included in the predetermined track via the magnetic head, the track position correction indicating the position passing through the central axis of the data sector A track position correction information acquisition step for acquiring information, and the magnetic head is made to follow the predetermined track while correcting the position of the magnetic head for each data sector based on the track position information and the track position correction information. Tracking with tracking control It is characterized by performing the control step.

  Preferably, the magnetic head is provided with a read head unit and a write head unit for independently reading and writing data, and after acquiring the track position information and the track position correction information, based on these information A magnetic recording marking step for applying a predetermined magnetic recording mark to a magnetic region constituting the magnetic pattern via the write head unit while performing tracking control, and after applying the predetermined magnetic recording mark, the magnetic disk A read / write head offset information acquisition step of acquiring read / write head offset information indicating a position passing through the central axis of the magnetic recording mark by reading the predetermined magnetic recording mark via the read head unit during rotation of Execute data for a given data sector If the magnetic recording, based on the track position correction information and read-write head offset information, it is configured to perform the tracking control while correcting the position of the write head portion with respect to the predetermined data sector.

  According to such a configuration, not only the servo sector is read, but also the magnetic pattern included in the data sector is read by the magnetic head, and the data sector based on the track position information (track position information and track position correction information) obtained thereby. You can know exactly the swell synchronized with. Therefore, even if the servo sector and the data sector are misaligned in the disk radial direction, the magnetic head can accurately follow the data sector. As a result, the positioning accuracy of the magnetic head with respect to the data sector can be increased, and as a result, data read / write errors can be drastically reduced.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a magnetic disk apparatus according to the present invention. This embodiment includes a magnetic disk X according to the present invention. The magnetic disk device A includes a magnetic disk X, a magnetic head 1, a spindle motor 2, a swing arm 3, an actuator 4, and a disk controller 5. A plurality of magnetic disks X are stacked one above the other at a predetermined interval, and each magnetic disk X is constituted by a discrete track medium having recording surfaces on both sides. The magnetic head 1 reads / writes data from / to the magnetic disk X, and is provided at the tip of each swing arm 3 so as to face the recording surface of the magnetic disk X. The magnetic head 1 is provided with a read head unit 10 and a write head unit 11 for reading and writing data independently so as to be arranged in the substantially circumferential direction of the magnetic disk X (see FIG. 2). The spindle motor 2 is rotation driving means 20 that rotates the magnetic disk X at a high speed (see FIG. 3). The swing arm 3 reciprocates the magnetic head 1 in the substantially radial direction of the magnetic disk X, and is quickly operated by the actuator 4. The actuator 4 comprises a voice coil motor or the like, and the head moving means 30 is constituted by the actuator 4 and the swing arm 3 (see FIG. 3). The disk controller 5 drives and controls the magnetic head 1, the spindle motor 2, and the actuator 4, and is composed of a microcomputer having a CPU, a memory, etc., or a wired logic circuit having a function equivalent to the microcomputer. The

  As shown in FIGS. 1 and 2, the magnetic disk X has a number of tracks T formed concentrically using a magnetic material and a nonmagnetic material. The adjacent tracks T are physically delimited by a guard band G made of a nonmagnetic material or a groove, and each track T is subdivided in the circumferential direction with the sector S as a unit. The interval between tracks T (track pitch Tp) is about several tens of nanometers. As well shown in FIG. 2, each sector S includes a servo sector SS used for tracking control (control for causing the magnetic head 1 to follow the track T) and data for magnetically recording data adjacent to the servo sector SS. A sector SD is provided. Such a magnetic disk X is manufactured by, for example, a nanoimprint method using a stamper.

  The servo sector SS is at the head portion of each sector S, and each servo sector SS includes a servo burst pattern S3. In addition, the servo sector SS includes magnetic patterns such as a preamble, an address mark, and a gray code, and among these, the gray code and the servo burst pattern S3 are used for tracking control. The servo burst pattern S3 is composed of four sets of A pattern S3a, B pattern S3b, C pattern S3c, and D pattern S3d. Each pattern S3a to S3d has a form in which a plurality of nonmagnetic regions S2 are periodically arranged in the magnetic region S1, and the width dimension (length along the radial direction of the magnetic disk X) of these patterns S3a to S3d is: It is about the same as the track pitch Tp. The A pattern S3a and the B pattern S3b are formed so as to be shifted to the left and right sides of the data sector SD without overlapping each other, and the left and right arrangement of the A pattern S3a and the B pattern S3b is the odd numbered track and the even numbered track. Vice versa. One of the C pattern S3c and the D pattern S3d defines the center axis SSax of the odd-numbered track servo sector SS, and the other defines the center axis SSax of the even-numbered track servo sector SS.

  A tracking error signal (hereinafter referred to as “PES signal”) is obtained by reading the servo code pattern having fine adjustment position information and the gray code having coarse adjustment position information including address information by the magnetic head 1. Based on the PES signal, it can be determined which side of the servo sector SS the magnetic head 1 is displaced. The servo burst pattern S3 that is a fine adjustment portion will be briefly described. First, four AD signals corresponding to the AD patterns S3a to S3d are obtained. By further calculating these A to D signals, (A−B) / (A + B) signals and (C−D) / (C + D) signals are obtained. For example, when the read head unit 10 of the magnetic head 1 is aligned with the central axis SSax of the servo sector SS belonging to this track T in accordance with the first track T from the top in FIG. 2, (AB) / The output of the (A + B) signal is 0, and the output of the (C−D) / (C + D) signal is plus (+). In a state where the read head unit 10 is aligned with the central axis SSax of the servo sector SS belonging to the second track T, the output of the (AB) / (A + B) signal is 0, but the (CD) / The output of the (C + D) signal becomes minus (−). Although the output of the (AB) / (A + B) signal is always positive (+) between the first and second tracks T, (CD) / The output of the (C + D) signal is any one of plus (+), minus (−), and 0. That is, a continuous fine position signal is obtained by a combination of the (A−B) / (A + B) signal and the (C−D) / (C + D) signal, while the coarse position obtained from the Gray code is obtained. A PES signal can be obtained by combining the signals, and tracking control can be performed.

  The data sector SD is located in each sector S following the servo sector SS, and is physically separated from the adjacent track T by the guard band G. In the head section of the data sector SD, a magnetic pattern S4 having a form in which a plurality of magnetic regions S1 and nonmagnetic regions S2 are simply arranged periodically is provided. In the data sector SD, a continuous magnetic region S1 capable of substantially magnetically recording data is provided as a data zone S5 at a portion following the magnetic pattern S4. Since the width dimension of the magnetic region S1 constituting the magnetic pattern S4 and the width dimension of the data zone S5 (length along the radial direction of the magnetic disk X) are defined by the guard band G, they are the same dimension. That is, the central axis SDax of the data sector SD coincides with the central axis of the magnetic pattern S4. However, the central axis SDax of the data sector SD is not necessarily coincident with the central axis SSax of the servo sector SS, and there is a certain amount of misalignment g1 due to a manufacturing error or the like. By reading such a magnetic pattern S4 while gradually displacing the magnetic head 1 in the radial direction of the magnetic disk X, a track profile signal P2 corresponding to this is obtained, and the peak value of this track profile signal P2 is obtained. By detecting, track position correction information indicating the position where the read head unit 10 of the magnetic head 1 passes through the central axis SDax of the data sector SD is acquired. Such track position correction information is used for tracking control by fine adjustment.

  As shown in FIG. 7, a magnetic recording mark M can be written in the magnetic region S1 constituting the magnetic pattern S4. The magnetic recording mark M is a region in which a predetermined magnetization direction is magnetized with a predetermined intensity distribution, but does not represent any information. After writing such a magnetic recording mark M, the magnetic recording mark M is read while gradually displacing the magnetic head 1 in the radial direction of the magnetic disk X as shown in FIG. A track profile signal P3 is obtained. By detecting the peak value of the track profile signal P3, read / write head offset information indicating the position where the read head unit 10 of the magnetic head 1 passes through the central axis Max of the magnetic recording mark M is obtained. Is done. The read / write head offset information is information indicating a relative positional deviation between the read head unit 10 and the write head unit 11, and according to such read / write head offset information and the track position correction information, for example, a manufacturing error The offset amount g2 (see FIG. 7) between the reading head unit 10 and the writing head unit 11 of the magnetic head 1 can be known. Such read / write head offset information is particularly used for tracking control by fine adjustment when writing data.

  When the offset amount between the read head unit 10 and the write head unit 11 is measured with reference to the track T, for example, a state where the offset is aligned with the innermost track T and a state where the offset is aligned with the outermost track T And different. This is because when the magnetic head 1 is swung by the swing arm 3 in a plane parallel to the magnetic disk X, the angle of the magnetic head 1 with respect to the track T changes.

  As shown in FIG. 3, the disk controller 5 includes functional modules such as a track position information acquisition unit 50, a track position correction information acquisition unit 51, a magnetic recording marking unit 52, a read / write head offset information acquisition unit 53, and a tracking control unit 54. Is included. Each of the track position information acquisition unit 50, the track position correction information acquisition unit 51, and the read / write head offset information acquisition unit 53 controls the magnetic head 1, the rotation driving unit 20, and the head moving unit 30 to control the track position information. Information, track position correction information, and read / write head offset information are acquired. These pieces of information are acquired by performing a low-level format at the final stage of the manufacturing process and stored in a memory. The magnetic recording marking unit 52 writes the magnetic recording mark M in the magnetic region S1 constituting the magnetic pattern S4 by controlling the magnetic head 1, the rotation driving unit 20, and the head moving unit 30. The tracking control unit 54 reads / writes data from / to the magnetic disk X based on the track position information and the track position correction information, or based on the track position correction information and the read / write head offset information. Tracking control by fine adjustment is performed so that the magnetic head 1 follows.

  Next, operations relating to tracking control of the magnetic disk device A will be described with reference to FIGS. FIG. 4 is a flowchart showing a control process of the magnetic disk device A, and FIGS. 5 to 8 are explanatory diagrams for schematically explaining each step of the control process.

  In the magnetic disk device A, the low-level format is executed at the final stage of the manufacturing process. In this low level format, as shown in the flowchart of FIG. 4, first, the track position information acquisition unit 50 reads the servo sector SS for each track T, thereby acquiring the track position information (S1). As shown in FIG. 5, the track position information is obtained as the position of the read head unit 10 of the magnetic head 1 along the central axis SSax of the servo sector SS. Basically, the magnetic head is based on this track position information. 1 is tracking-controlled.

  Next, the track position correction information acquisition unit 51 acquires the track position correction information by reading the magnetic pattern S4 in the head section of each data sector SD for each track T (S2). The track position correction information is obtained by gradually displacing the magnetic head 1 in the radial direction of the magnetic disk X from the state in which the magnetic head 1 follows each servo sector SS based on the track position information. This is done by reading the magnetic pattern S4 in the sector SD. That is, as shown in FIG. 6, the peak value of the track profile signal P2 output from the magnetic head 1 is detected, and the position corresponding to this peak value is on the central axis SDax of the data sector SD and the read head portion of the magnetic head 1 10 is acquired as the track position correction information indicating the position where 10 matches. According to such track position correction information, the track position to be corrected is determined for each data sector SD, and the profile of the track T including periodic waviness corresponding to the disk circumferential direction position of the data sector SD is found. That is, according to the track position correction information, the relative positional deviation amount g1 between the servo sector SS and the data sector SD subsequent thereto is detected based on this and the track position information obtained in the previous step S1.

  The track position information and the track position correction information are read track position information serving as a reference for causing the read head unit 10 of the magnetic head 1 to follow the track T when data written on a predetermined track T is read. Confirm (S3).

  Next, the magnetic recording marking unit 52 causes the magnetic head 1 to follow the predetermined data sector SD based on the read track position information, and magnetically applies to the magnetic region S1 of the magnetic pattern S4 in the head section of the data sector SD. A recording mark M is given (S4). As shown in FIG. 7, the magnetic recording mark M is written from the write head portion 11 of the magnetic head 1 to the magnetic region S1 of the magnetic pattern S4 at a predetermined timing according to the rotational speed of the magnetic disk X. At this time, the read head unit 10 of the magnetic head 1 is aligned with the central axis SDax of the data sector SD, while the write head unit 11 is shifted from the read head unit 10 by the offset amount g2. Therefore, the magnetic recording mark M written in the magnetic region S1 is magnetically displaced in the radial direction of the magnetic disk X.

  When writing the magnetic recording mark M, for example, the drive current of the write head unit 11 may be set to a current value lower than that in the case of writing normal data. Further, the write head unit 11 is driven at a frequency higher than a periodic signal obtained by reading the magnetic region S1 and the nonmagnetic region S2 of the magnetic pattern S4 and at a frequency that does not cause magnetic erase writing. Also good. Alternatively, the write head unit 11 may be driven by a combination of these controls. According to this, when the write head unit 11 is displaced from the read head unit 10, the magnetic recording mark M is written in a magnetically displaced state in the radial direction of the magnetic disk X in the magnetic region S 1.

  Next, the read / write head offset information acquisition unit 53 acquires the read / write head offset information by reading the magnetic recording mark M written in the magnetic region S1 of the magnetic pattern S4 (S5). The read / write head offset information is acquired from the state in which the read head unit 10 of the magnetic head 1 is aligned with the central axis SDax of the target data sector SD based on the track position correction information, and then the magnetic head X is magnetically aligned. This is done by reading the magnetic recording mark M while gradually displacing the head 1. That is, as shown in FIG. 8, the peak value of the track profile signal P3 output from the magnetic head 1 is detected, and the position corresponding to this peak value is set to the central axis Max of the magnetic recording mark M and the reading head of the magnetic head 1 Acquired as read / write head offset information indicating the position where the unit 10 matches. According to such read / write head offset information, the relative offset amount g2 between the read head unit 10 and the write head unit 11 is detected.

  The track position correction information and the read / write head offset information are determined as reference write track position information for causing the write head unit 11 of the magnetic head 1 to follow the track T when data is written to the predetermined track T. (S6).

  The low-level format is completed by executing the above steps S1 to S6. Thereafter, the tracking control unit 54 performs tracking control processing based on the read track position information and the write track position information when reading / writing data from / to the magnetic disk X (S7). In the tracking control process, for example, when data is read from the data sector SD of a predetermined track T, the reading head unit 10 is substantially aligned with the track T based on the track position information, and further based on the track position correction information. This is done by correcting the position of the read head unit 10 along the central axis SDax of the data sector SD. For example, when data is written in a data sector SD of a predetermined track T, the tracking control process further includes read / write head offset information from the state where the read head unit 10 is aligned with the data sector SD based on the track position correction information. Is performed by offset correcting the position of the write head unit 11 along the central axis SDax of the data sector SD. As a result, data reading / writing is accurately performed on the data sector SD each time.

  Therefore, according to the magnetic disk apparatus A of the present embodiment, even if the central axis SSax of the servo sector SS is shifted from the central axis SDax of the data sector SD, the read head unit 10 of the magnetic head 1 is moved with respect to the data sector SD. Can be followed accurately. Even if there is an offset between the read head unit 10 and the write head unit 11 of the magnetic head 1, the write head unit 11 can be made to accurately follow the data sector SD. As a result, the positioning accuracy of the magnetic head 1 with respect to the data sector SD can be considerably increased as compared with the conventional case, and as a result, data read / write errors can be drastically reduced.

  9 to 11 are partially enlarged plan views showing other embodiments of the magnetic disk according to the present invention. Note that the same or similar components as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9 as an example, in another embodiment of the magnetic disk, a magnetic pattern S4 may be provided in the rear end section in addition to the head section of the data sector SD. As described above, when the magnetic pattern S4 is present not only in the head section but also in the rear section, the average position of the data sector SD can be determined by reading both magnetic patterns S4. The positioning accuracy of the magnetic head 1 with respect to the data sector SD can be further increased.

  As an example shown in FIG. 10, as another embodiment of the magnetic disk, the servo burst pattern S3 of the servo sector SS may be a known phase pattern. By reading the servo burst pattern S3 having such a phase pattern, the track position information can be obtained by detecting the phase difference from the PES signal.

  As shown in FIG. 11 as an example, as another embodiment of the magnetic disk, a form in which magnetic regions S1 and nonmagnetic regions S2 are alternately arranged may be used as the data zone S5. A magnetic disk having such a data zone S5 is generally called a patterned medium. Even with such a patterned magnetic disk, the positioning accuracy of the magnetic head 1 with respect to the data sector SD can be improved.

  The present invention is not limited to the above embodiments.

  For example, the magnetic pattern in the data sector only needs to be an array of at least one magnetic region and a nonmagnetic region. The magnetic pattern in the data sector may be provided in the middle of the data sector, for example.

  For example, the magnetic recording mark may be written in the magnetic pattern of all data sectors, or may be written in one magnetic pattern for each track.

1 is an overall perspective view showing an embodiment of a magnetic disk device according to the present invention. FIG. 2 is a partially enlarged plan view showing a sector structure of the magnetic disk shown in FIG. 1. FIG. 2 is a block diagram of the magnetic disk device shown in FIG. 1. 3 is a flowchart showing a control process of the magnetic disk device shown in FIG. FIG. 5 is an explanatory diagram for schematically explaining the track position information acquisition step of FIG. 4. FIG. 5 is an explanatory diagram for schematically explaining the track position correction information acquisition step of FIG. 4. It is explanatory drawing for demonstrating typically the magnetic recording marking step of FIG. FIG. 5 is an explanatory diagram for schematically explaining the read / write head offset information acquisition step of FIG. 4. It is the elements on larger scale which show other embodiments of the magnetic disc concerning the present invention. It is the elements on larger scale which show other embodiments of the magnetic disc concerning the present invention. It is the elements on larger scale which show other embodiments of the magnetic disc concerning the present invention.

Explanation of symbols

A magnetic disk device X magnetic disk T track S sector SS servo sector SD data sector S1 magnetic area S2 nonmagnetic area S3 servo burst pattern S4 magnetic pattern S5 data zone M magnetic recording mark 1 magnetic head 10 read head section 11 write head section 20 rotation Driving means 30 Head moving means 50 Track position information acquisition unit (track position information acquisition means)
51 Track position correction information acquisition unit (track position correction information acquisition means)
52 Magnetic recording marking part (magnetic recording marking means)
53 Read / write head offset information acquisition unit (read / write head offset information acquisition means)
54 Tracking control unit (tracking control means)

Claims (7)

Adjacent tracks are physically separated by nonmagnetic material or grooves, and these tracks are subdivided into sectors. Each of the sectors includes a servo sector used for tracking control and a servo sector. A magnetic disk having a structure provided with a data sector for magnetically recording data adjacent thereto,
2. A magnetic disk according to claim 1, wherein a predetermined pattern in the data sector is provided with a magnetic pattern comprising an array of magnetic areas and non-magnetic areas.   The magnetic disk according to claim 1, wherein a data zone in which data can be substantially magnetically recorded is provided adjacent to the magnetic pattern in the data sector.   The servo sector includes a servo burst pattern for tracking control. A part of the servo burst pattern is formed so as to be shifted on both sides of the data sector, while the magnetic region constituting the magnetic pattern is The magnetic disk according to claim 2, wherein the magnetic disk is formed so as to be aligned with the data zone. Adjacent tracks are physically separated by nonmagnetic material or grooves, and these tracks are subdivided into sectors. Each of the sectors includes a servo sector used for tracking control and a servo sector. A magnetic sector having a structure in which a data sector for magnetic recording of data is provided adjacently, and a predetermined pattern in the data sector is provided with a magnetic pattern comprising an array of magnetic and nonmagnetic regions A disk, a magnetic head for reading / writing data from / to the magnetic disk, a rotation driving means for rotating the magnetic disk, and a head moving means for moving the magnetic head in a substantially radial direction of the magnetic disk. A magnetic disk device,
Track position information acquisition means for acquiring track position information indicating a position passing through the central axis of the servo sector by reading the servo sector included in the predetermined track via the magnetic head during rotation of the magnetic disk;
Track position correction information for acquiring track position correction information indicating a position passing through the central axis of the data sector by reading the magnetic pattern included in the predetermined track through the magnetic head while the magnetic disk is rotating. Acquisition means;
Tracking control means for performing tracking control so that the magnetic head follows the predetermined track while correcting the position of the magnetic head for each data sector based on the track position information and the track position correction information;
A magnetic disk device comprising: The magnetic head is provided with a read head unit and a write head unit for independently reading and writing data,
After obtaining the track position information and the track position correction information, the magnetic force for applying a predetermined magnetic recording mark to the magnetic area constituting the magnetic pattern via the write head unit while performing tracking control by the tracking control unit. Record marking means;
A read / write head offset indicating a position passing through the central axis of the magnetic recording mark by reading the predetermined magnetic recording mark through the reading head unit while the magnetic disk is rotating after the predetermined magnetic recording mark is applied. A read / write head offset information acquisition means for acquiring information;
The tracking control means corrects the position of the write head with respect to the predetermined data sector based on the track position correction information and the read / write head offset information when magnetically recording data on the predetermined data sector. The magnetic disk device according to claim 4, which is configured as follows. Adjacent tracks are physically separated by non-magnetic material or grooves, and these tracks are subdivided into sector units. Each of the sectors includes a servo sector used for tracking control and a servo sector. A magnetic sector having a structure in which a data sector for magnetic recording of data is provided adjacently, and a predetermined pattern in the data sector is provided with a magnetic pattern comprising an array of magnetic and nonmagnetic regions A disk, a magnetic head for reading / writing data from / to the magnetic disk, a rotation driving means for rotating the magnetic disk, and a head moving means for moving the magnetic head in a substantially radial direction of the magnetic disk Tracking control method for performing tracking control,
A track position information acquisition step for acquiring track position information indicating a position passing through the central axis of the servo sector by reading the servo sector included in the predetermined track via the magnetic head during the rotation of the magnetic disk;
Track position correction information for acquiring track position correction information indicating a position passing through the central axis of the data sector by reading the magnetic pattern included in the predetermined track through the magnetic head while the magnetic disk is rotating. An acquisition step;
A tracking control step for performing tracking control so that the magnetic head follows the predetermined track while correcting the position of the magnetic head for each data sector based on the track position information and the track position correction information;
The tracking control method characterized by performing. The magnetic head is provided with a read head unit and a write head unit for independently reading and writing data,
After obtaining the track position information and the track position correction information, a magnetic field for applying a predetermined magnetic recording mark to the magnetic area constituting the magnetic pattern via the write head unit while performing tracking control based on the information. A record marking step;
A read / write head offset indicating a position passing through the central axis of the magnetic recording mark by reading the predetermined magnetic recording mark through the reading head unit while the magnetic disk is rotating after the predetermined magnetic recording mark is applied. Further executing a read / write head offset information acquisition step of acquiring information,
When magnetically recording data to the predetermined data sector, tracking control is performed while correcting the position of the write head relative to the predetermined data sector based on the track position correction information and the read / write head offset information. The tracking control method according to claim 6, which is configured.

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