JP2010165411A - Recording medium, information storage device, and control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain highly accurate positioning of a recording and playback head. <P>SOLUTION: Since a first servo pattern 34, a second servo pattern 36 and a system region 62 are disposed along a circumferential direction in an inner peripheral part of a disk substrate of a magnetic disk 18, third servo patterns 64a to 64c can be recorded on the second servo pattern 36 from the part in the vicinity of an inner peripheral end or an outer peripheral end of the magnetic disk by using the first servo pattern 34 and the second servo pattern 36. In this case, since the third servo patterns may not be recorded in a connected state to the first servo pattern, the third servo patterns can be highly accurately recorded even when a head orbit (e.g. an arc orbit) of an external STW (Servo Track Writing) device and an orbit (e.g. an arc orbit) of the recording and playback head 12 are different from each other (radii of the arcs are different from each other), and thereby attaining highly accurate positioning of the recording and playback head. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a recording medium, an information storage device, and a control device, and in particular, includes a recording medium including a first servo pattern having absolute position information and a second servo pattern having relative position information, and the recording medium. The present invention relates to an information storage device and a control device connected to the information storage device.

  On a recording medium such as a magnetic disk mounted on an information storage device such as a magnetic disk device, a servo pattern used for positioning control of a recording / reproducing head that performs reading and writing of data with respect to the recording medium is formed. The recording / reproducing head is positioned on the target track on the recording medium based on the read result of the servo pattern.

  The servo pattern formed on the recording medium is generally formed radially from the inside to the outside of the recording medium. As another servo pattern, a servo pattern having a spiral (spiral) servo pattern and concentric servo patterns connected to the servo pattern has been proposed (for example, see Patent Document 1).

  The servo pattern is formed on the recording medium in an external STW (Servo Track Writing) facility. However, if the servo pattern is recorded on the entire surface of the recording medium with an external STW facility, the recording of the servo pattern on one recording medium takes a long time, so one facility occupies one facility for a long time. Will do. In addition, for the above reason, it is necessary to increase the number of external STW facilities, which may lead to an increase in capital investment cost.

  On the other hand, in recent years, a method of magnetically writing a servo pattern in an information storage device on which a recording medium is mounted has been proposed for the purpose of reducing the capital investment cost in an external STW facility (for example, (See Patent Documents 2 and 3). In this method, a spiral servo pattern having a spiral shape (spiral) is formed by a recording / reproducing head in an information storage device, and a radial servo pattern is formed by using this spiral servo pattern.

JP 61-59671 A US Pat. No. 5,668,679 US Pat. No. 7,145,744

  Recently, various studies have been made on the practical application of a method for forming a servo pattern using a spiral servo pattern as a reference. In this method, a first servo pattern including absolute position information is formed in advance on a part of the recording medium, and a second servo pattern including relative position information is formed in advance on the entire surface of the recording medium. Is mounted in the magnetic storage device, and then a third servo pattern including absolute position information is formed on the entire surface of the magnetic disk using the first and second servo patterns.

  However, in the examination for practical application of the present method, various problems such as accuracy problems and cost problems have newly appeared.

  Therefore, the present invention has been made in view of the above problems, and provides a recording medium capable of recording the third servo pattern with high accuracy in substantially the entire range from the inner periphery to the outer periphery of the recording medium body. For the purpose. Another object of the present invention is to provide an information storage device capable of recording and reproducing information with high accuracy. It is another object of the present invention to provide a control device that can contribute to higher accuracy of recording and reproduction in an information storage device.

  The recording medium described in the present specification includes a disc-shaped recording medium body, a first servo pattern having absolute position information on the recording medium body, and a second position having relative position information on the recording medium body. A servo area and a system area in which data used when recording a third servo pattern having absolute position information on the recording medium body using the first and second servo patterns is stored. The first servo pattern, the second servo pattern, and the system area are arranged along the circumferential direction in at least one of the outer peripheral portion and the inner peripheral portion of the recording medium body.

  According to this, the first servo pattern, the second servo pattern, and the system area are arranged along the circumferential direction in at least one of the outer peripheral portion and the inner peripheral portion of the recording medium body. The third servo pattern can be recorded on the second servo pattern from one side of the outer peripheral portion and the inner peripheral portion of the recording medium main body without writing over the servo pattern. Thus, since it is not necessary to write the third servo pattern to the first servo pattern, the shape error between the first servo pattern and the third servo pattern (the trajectory error of the recording head (the arc trajectory) The third servo pattern can be recorded with high accuracy from one side of the inner and outer circumferences of the recording medium main body to the other side without being affected by the difference in radius)).

  An information storage device described in the present specification includes a recording medium described in the present specification, a recording / reproducing head for recording / reproducing information on the recording medium, information on the first and second servo patterns, and An information storage comprising: a recording signal generation unit that generates a control signal for recording the third servo pattern on the recording medium using the recording / reproducing head based on data stored in a system area Device.

  According to this, since the third servo pattern can be recorded on the storage medium described in this specification with high accuracy by the control signal generated by the recording signal generation unit, the third servo pattern is used. As a result, information can be recorded and reproduced with high accuracy. Further, since the third servo pattern is recorded in the apparatus, it is possible to reduce the cost spent on the external STW facility.

  The control device described in the present specification is connected to an information storage device including a recording medium described in the present specification and a recording / reproducing head for recording / reproducing information with respect to the recording medium. Control for generating a control signal for recording the third servo pattern on the recording medium using the recording / reproducing head based on the information of the servo pattern of 2 and the data stored in the system area Device.

  According to this, the third servo pattern is added to the storage medium described in this specification by using the control signal generated based on the information of the first and second servo patterns and the data stored in the system area. Since the information can be recorded with high accuracy, the information recording / reproducing accuracy in the information storage device can be improved by using the third servo pattern recorded in this way. That is, according to the control device described in the present specification, it is possible to contribute to the improvement in accuracy of information recording / reproduction in the information storage device.

  The recording medium described in the present specification has an effect that the third servo pattern can be recorded with high accuracy in almost the entire range from the inner periphery to the outer periphery of the recording medium body. In addition, the information storage medium described in this specification has an effect that information can be recorded and reproduced with high accuracy. In addition, the control device described in the present specification has an effect that it can contribute to higher accuracy of recording and reproduction in the information storage device.

1 is a block diagram schematically showing a configuration of a magnetic disk device according to an embodiment. FIG. FIG. 2 is a plan view showing the magnetic disk of FIG. 1 (a magnetic disk before or just after being mounted on a magnetic disk device). FIG. 3 is an enlarged view showing a region on an inner peripheral side of the magnetic disk of FIG. It is a figure for demonstrating the format of the data currently recorded on the 1st servo pattern. It is a flowchart which shows the rewrite formation process of a 3rd servo pattern. FIG. 6A is a diagram showing a servo gate control method when reading and writing to the system area, and FIG. 6B is a diagram showing a servo gate control method when reading and writing other than the system area. It is. It is FIG. (1) for demonstrating the formation method of a 3rd servo pattern. It is FIG. (2) for demonstrating the formation method of a 3rd servo pattern. It is a figure shown about the arrangement | positioning of the 1st servo pattern and system area | region considered conventionally. FIG. 10 is a diagram illustrating a state where a third servo pattern is formed in the arrangement of FIG. 9. It is a figure shown about the arrangement | positioning of the 1st servo pattern and system area | region based on a modification. FIG. 12 is a diagram showing a state where a third servo pattern is formed in the arrangement of FIG. 11.

  Hereinafter, a magnetic disk 18 and a magnetic disk device 100, which are an embodiment of a recording medium and an information storage device of the present invention, will be described in detail with reference to FIGS.

  FIG. 1 shows a block diagram of a magnetic disk device 100 according to the present embodiment. As shown in FIG. 1, the magnetic disk device 100 includes a disk enclosure 80 and a control board 90.

  Among these, the disk enclosure 80 includes a head amplifier 10, a recording / reproducing head 12, a voice coil motor 14, a spindle motor 16, and a magnetic disk 18.

  The head amplifier 10 transmits data input from the read channel 28 to the recording / reproducing head 12 (recording element) and transmits data read by the recording / reproducing head 12 (reproducing element) to the read channel 28.

  The recording / reproducing head 12 includes a main body made of ceramic or the like, a recording element for writing information (data) on the magnetic disk 18 incorporated in the main body, and a reproducing element for reading the written data. .

  The voice coil motor 14 drives a head stack assembly (HSA) that holds the recording / reproducing head 12 under the control of the servo controller 26, and positions the recording / reproducing head 12 at a desired position on the magnetic disk 18. The spindle motor 16 rotates the magnetic disk 18 at an appropriate rotation speed such as 4200 to 15000 rpm under the control of the servo controller 26.

  The magnetic disk 18 is a recording medium for recording data by changing the magnetization state of a magnetic material. On the magnetic disk 18, a servo pattern used for positioning control of the recording / reproducing head 12 is formed in addition to an area for storing user data. Here, the magnetic disk 18 before and immediately after being mounted in the disk enclosure 80 has a servo pattern as shown in FIG. Specifically, the magnetic disk 18 includes a first servo pattern 34 provided at a predetermined interval along the circumferential direction in a region near the inner periphery of the disk substrate 190 as a storage medium body, and the disk substrate 190. And a second servo pattern 36 having a spiral shape (spiral shape) provided on the entire surface.

  In the present embodiment, after the magnetic disk 18 is mounted on the magnetic disk device 100, the third servo pattern including the absolute position information is recorded on the entire surface of the magnetic disk 18, but the first and second servo patterns 34 are recorded. , 36 are used for positioning the recording / reproducing head 12 in this recording. The first servo pattern 34 and the second servo pattern 36 are formed in advance in an external STW (Servo Track Writing) facility.

  FIG. 3 shows an enlarged state of a part of the area near the inner periphery of the magnetic disk 18. As shown in FIG. 3, the first servo pattern 34 extends in the radial direction of the magnetic disk 18. That is, the first servo pattern 34 is provided radially from the inside of the magnetic disk 18.

  FIG. 4 shows the format of data recorded in the first servo pattern 34. As shown in FIG. 4, the first servo pattern 34 includes a preamble 38, a servo sync mark 40, sector data 42, a gray code 44, and a phase burst 46.

  The preamble 38 is used to make the amplitude constant by adjusting the amplification factor of the reproduction output before reading out servo data such as sector data and gray code. The servo sync mark 40 is used to find the beginning of servo data. The sector data 42 has sector number information and indicates what number of servo data in one track. The gray code 44 records track number information using a gray code. The phase burst 46 has relative position information of the recording / reproducing head 12 with respect to the track, and is used for accurately positioning the recording / reproducing head 12 at the center of the target track.

  As described above, in the present embodiment, since the first servo pattern 34 includes the gray code 44 and the like, the absolute position on the magnetic disk 18 is specified by reading the first servo pattern 34. Can do. That is, it can be said that the first servo pattern 34 includes absolute position information on the magnetic disk 18.

  Returning to FIG. 3, the second servo pattern 36 has a spiral shape (spiral shape) and intersects the first servo pattern 34. The second servo pattern 36 includes a sync mark and a burst (both not shown). Among these, the sync mark is used as reference timing information in the circumferential direction. The burst indicates the position of the second servo pattern 36 by the amplitude peak position timing. As described above, in the present embodiment, since the second servo pattern 36 does not include a gray code or the like, the absolute position on the magnetic disk 18 can be specified even if the second servo pattern 36 is read. Instead, only the relative position can be specified. That is, it can be said that the second servo pattern 36 includes relative position information on the magnetic disk 18.

  As shown in FIG. 3, a system area 62 is provided at a position adjacent to the first servo pattern 34. The system area 62 stores information on an inner reference position, which will be described later, schedule data for recording the third servo pattern, and the like.

  As can be seen from the above description, in the predetermined range in the radial direction of the magnetic disk 18 (range A in FIG. 3), the first servo pattern 34, the second servo pattern 36, and the system area 62 are in the circumferential direction. Are arranged repeatedly.

  Returning to FIG. 1, the control board 90 includes a hard disk controller 20, a data buffer 22, a memory 24 as a recording unit, a servo controller 26, a read channel 28, and an MPU (Micro Processing Unit) 30. Among these, the hard disk controller 20, the memory 24, the servo controller 26, the read channel 28, and the MPU 30 are connected to each other via the system bus 32.

  The hard disk controller 20 exchanges various commands and data with a host system such as a computer that is a host of the magnetic disk device 100. The data buffer 22 temporarily stores data from the host system.

  The memory 24 includes, for example, a volatile memory such as a RAM (Random Access Memory) and a nonvolatile memory such as a flash ROM (Read Only Memory). The RAM is a work memory used when the MPU 30 executes control processing. The flash ROM stores a control program executed by the MPU 30 in advance.

  The servo controller 26 controls driving of the voice coil motor 14 and the spindle motor 16 based on an instruction from the MPU 30.

  The read channel 28 functions as a write modulation unit and a read demodulation unit.

  The MPU 30 controls the entire magnetic disk device 100. As shown in FIG. 1, the MPU 30 includes a reference position detection unit 52, a head position control unit 54, and a recording signal generation unit 56. The reference position detection unit 52 obtains the reference position of the second servo pattern 36 from the positional relationship between the first servo pattern 34 and the second servo pattern 36 read and demodulated by the recording / reproducing head 12. The head position control unit 54 controls the positioning of the recording / reproducing head 12 at a desired position on the magnetic disk 18. The recording signal generator 56 generates a recording signal for recording the third servo pattern having the absolute position information on the magnetic disk 18 at the target position by the recording / reproducing head 12 whose positioning is controlled at the target position.

  Next, a method (rewrite forming method) for forming a third servo pattern having absolute position information on the entire surface of the magnetic disk 18 using the first servo pattern 34 and the second servo pattern 36 will be described with reference to FIG. This will be described with reference to the flowchart.

  As a premise that the processing of FIG. 5 is executed, the reference position detection unit 52 of the MPU 30 has previously detected the reference position (inner reference position shown in FIG. 3), and the detection result (information on the reference position) is Are stored in the system area 62. The system area 62 stores information (schedule data) such as the number of rewrites that need to be executed to form the third servo pattern and the cylinder position in each rewrite. In the present embodiment, the case where the third servo pattern (64a, 64b, 64c) is formed by rewrite formation three times will be described as an example.

  First, the first rewrite formation will be described.

  The MPU 30 (head position control unit 54) controls the drive of the spindle motor 16 and the voice coil motor 14 via the servo controller 26 in step S30 of FIG. 5, and controls the recording / reproducing head 12 in the first servo pattern 34. Position on the target track. In this case, by using information such as the gray code 44 and the phase burst 46 of the first servo pattern 34, the recording / reproducing head 12 can be positioned on the target track.

  Next, the MPU 30 reads information on the reference position (such as information on the cylinder position) recorded in the system area 62 in step S32. Further, the MPU 30 reads the rewrite formation schedule data recorded in the system area 62 in step S34. Here, when reading information from the system area 62, the servo gate SG is opened outside the system area 62, as shown in FIG. On the other hand, when the system area 62 is not accessed, the servo gate SG is opened in a range covering the first servo pattern 34 as shown in FIG. By controlling the servo gate SG as described above, it is possible to read information from the system area 62. Even when information is written to the system area 62, the servo gate control as shown in FIG. 6A may be performed as described above.

  Next, in step S36, the MPU 30 determines whether all the rewrite formation schedules have been completed. Here, since rewrite formation has not been performed yet, the determination is negative, and the process proceeds to step S38. Next, the MPU 30 (head position control unit 54) controls the spindle motor 16 and the voice coil motor 14 via the servo controller 26 in step S38, and records them at the reference position read from the system area 62 (see FIG. 3). The reproducing head 12 is moved. In this movement, information such as the gray code 44 and the phase burst 46 of the first servo pattern 34 can be used.

  Next, in step S <b> 40, the MPU 30 switches the positioning control of the recording / reproducing head 12 from the positioning control using the first servo pattern 34 to the positioning control using the second servo pattern 36. Thereafter, the MPU 30 (head position control unit 54) moves the recording / reproducing head 12 to the rewrite formation start position based on the schedule data read from the system area 62 in step S42. In the present embodiment, in the case of the first rewrite formation, since the rewrite formation proceeds from the cylinder position at the reference position, the recording / reproducing head 12 is not moved in step S42, but the reference position is used as a reference. The rewrite formation may proceed from the predetermined cylinder position.

  Next, the MPU 30 (head position control unit 54), in step S44, based on the cylinder position information in the first rewrite formation schedule read from the system area 62, the spindle motor 16 and the voice coil motor 14 via the servo controller 26. And the positioning control of the recording / reproducing head 12 is performed. The positioning control of the recording / reproducing head 12 at this time is performed using the second servo pattern 36. While the positioning control of the recording / reproducing head 12 is being performed, the MPU 30 (recording signal generator 56) generates a recording signal for rewriting the third servo pattern (64a) in step S46. A recording signal for rewriting the third servo pattern (64a) is transmitted to the recording / reproducing head 12 via the read channel 28. As a result, as shown in FIG. 7A, the third servo pattern 64a is formed at the position where the recording / reproducing head 12 has moved (step S48). In this case, as shown in FIG. 7A, the third servo pattern 64a is displaced in the circumferential direction with respect to the first servo pattern 34 and the system area 62 (on the second servo pattern 36). Formed. That is, in the predetermined range (range A in FIG. 3) in the radial direction of the magnetic disk 18, the first servo pattern 34, the second servo pattern 36, the third servo pattern, and the system area 62 are arranged in the circumferential direction. Are repeatedly arranged along. When the third servo pattern 64 a is formed on the magnetic disk 18, the third servo pattern 64 a is sequentially formed for each sector while moving the recording / reproducing head 12 in the radial direction with respect to the rotating magnetic disk 18.

  Here, as described above, the second servo pattern 36 has relative position information on the magnetic disk 18, and the reference position of the second servo pattern 36 has absolute position information. Therefore, the positioning control of the recording / reproducing head 12 is executed from the reference position of the second servo pattern 36, and thereafter, the second servo pattern 36 is used to identify the absolute position on the magnetic disk 18. The positioning control of the recording / reproducing head 12 can be performed.

  The first servo pattern 34 and the third servo pattern 64a basically have the same configuration (configuration in FIG. 4), but only the contents (definitions) of the servo sync mark 40 are different. It has become. By differentiating the servo sync marks 40 in this way, even if the first servo pattern 34 and the third servo pattern 64a coexist on the magnetic disk 18, the first servo pattern 34 ( Alternatively, it is possible to reliably detect the third servo pattern 64a). Therefore, appropriate positioning using the first servo pattern 34 can be performed also in the second and third rewrite formation performed thereafter.

  After the first rewrite formation is completed as described above, the MPU 30 (head position control unit 54) stops the positioning control using the second servo pattern 36 in step S50, and the recording / reproducing head 12 Is unloaded outside the magnetic disk 18.

  Next, in step S52, the MPU 30 (head position control unit 54) uses the information such as the gray code 44 and the phase burst 46 of the first servo pattern 34 again to move the recording / reproducing head 12 into the first servo pattern 34. Position on the target track. In step S50 described above, the recording / reproducing head 12 is temporarily unloaded outside the magnetic disk 18 because the positioning control of the recording / reproducing head 12 is switched from the second servo pattern 36 to the first servo pattern 34. It is necessary.

  Next, in step S54, the MPU 30 records the completion of the first rewrite formation (the formation of the third servo pattern 64a) in the system area 62.

  Next, the second rewrite formation is performed as follows.

  In step S34, the MPU 30 reads the rewrite formation schedule data and the information indicating that the first rewrite formation recorded in step S52 has been completed from the system area 62, and in the next step S36, all the rewrite formation schedules are read. Determine if it is finished. Here, in step S34, the determination is negative because only the information on completion of the first rewrite formation is read out of the three rewrite formations, and the process proceeds to step S38. Then, the MPU 30 (head position control unit 54) moves the recording / reproducing head 12 to the reference position in step S38, and performs positioning control of the recording / reproducing head 12 using the first servo pattern 34 in step S40. The control is switched to the positioning control using the second servo pattern 36. Thereafter, in steps S42 and S44, the MPU 30 records the recording / reproducing head 12 at the second rewrite formation start position based on the rewrite formation schedule data read from the system area 62 and information indicating that the first rewrite formation has been completed. Move to position. In this case, the second rewrite formation start position is a cylinder position adjacent to the first rewrite formation end position. Thereafter, the MPU 30 executes Steps S46 to S48 to form the third servo pattern 64b as shown in FIG. 7B.

  As described above, at the stage where the second rewrite formation is completed, the MPU 30 unloads the recording / reproducing head 12 to the outside of the magnetic disk 18 (step S50), and again moves the recording / reproducing head 12 to the first servo. Positioning is performed on the target track in the pattern 34 (step S52), and the completion of the second rewrite formation is recorded in the system area 62 (step S54).

  Thereafter, the MPU 30 executes the third retry formation by executing steps S34 to S54 again. By this third retry formation, a third servo pattern 64c as shown in FIG. 8 is formed on the magnetic disk 18. In step S54, the MPU 30 records in the system area 62 that the third rewrite formation has been completed.

  Next, the MPU 30 reads the rewrite formation schedule data and the information on the completion of the third rewrite formation from the system area 62 (step S34), and determines whether all the rewrite formation schedules have been completed (step S36). If the MPU 30 determines that the rewrite formation schedule has been completed based on the rewrite formation schedule data read from the system area 62 and the information on the completion of the third rewrite formation, the determination in step S36 is affirmed, and step S56 is performed. Migrate to

  Thereafter, in step S56, the MPU 30 records that all rewrite formation is completed in the system area 62, and ends all the processes in FIG.

  After the third servo patterns 64a to 64c are formed on the magnetic disk 18 as described above, normal recording / reproduction processing can be performed on the magnetic disk 100. That is, in the magnetic disk device 100, since the recording / reproducing head 12 can be positioned using the third servo patterns 64a to 64c, the third servo patterns 64a to 64c having absolute position information are used thereafter. As a result, the recording / reproducing head 12 can be positioned with high accuracy, and consequently, the recording / reproducing with the recording / reproducing head 12 can be performed with high accuracy.

  As described above in detail, according to the present embodiment, the first servo pattern 34, the second servo pattern 36, and the system region 62 are arranged along the circumferential direction in the inner peripheral portion of the disk substrate 190 of the magnetic disk 18. The third servo patterns 64a to 64c are formed on the second servo pattern 36 from the vicinity of the inner peripheral edge of the magnetic disk 18 using the first servo pattern 34 and the second servo pattern 36. Can be recorded.

Here, conventionally, the arrangement of the first servo pattern 34 ′, the second servo pattern 36 ′, and the system area 62 as shown in FIG. 9 has been studied. However, when the arrangement as shown in FIG. 9 is adopted, in order to form the third servo pattern over almost the entire radial direction of the magnetic disk 18 without erasing the system area 62, as shown in FIG. The third servo patterns 64 a ′ to 64 c ′ need to be connected to the first servo pattern 34. In this case, the first servo pattern 34 is formed using the head in the external STW facility, and the third servo patterns 64a ′ to 64c ′ are formed using the recording / reproducing head 12 in the magnetic disk device 100. As a result, the following problems have arisen.
(1) When the track of the head of the external STW facility (for example, an arc track) and the track of the recording / reproducing head 12 (for example, the arc track) are different (the arc radii are different), the first servo pattern 34 'and the first servo pattern 34' There is a possibility that a shift occurs in a portion where the third servo pattern 64a ′ is connected, and the recording / reproducing head cannot be positioned with high accuracy.
(2) Since the mechanism for forming the servo pattern is different between the external STW equipment and the magnetic disk device 100, the feed accuracy and control method in the radial direction are different, the track pitch of the first servo pattern, the third Servo pattern track pitch may be different.
(3) The first servo pattern recorded by the external STW facility may have an eccentric component when mounted on the magnetic disk device 100.
(4) Since the recording / reproducing head used in the external STW facility and the recording / reproducing head 12 used in the magnetic disk device 100 are not the same, the first servo is caused by the difference in distance between the recording element and the reproducing element in the head. There is discontinuity between the pattern and the third servo pattern. If such a discontinuous portion exists, an error occurs in positioning information using a Gray code or a burst, and there is a possibility that positioning accuracy may be lowered.
On the other hand, in the present embodiment (FIG. 8), the third servo pattern 64a can be formed without being connected to the first servo pattern 34. Therefore, as described in (1) to (4) above. Therefore, it is possible to achieve a highly accurate positioning of the recording / reproducing head.

  Further, according to the magnetic disk device 100 of the present embodiment, the third servo patterns 64a to 64c can be recorded on the magnetic disk 18 with high accuracy by a control signal generated by the MPU 30 (recording signal generation unit 56). As a result, the recording / reproducing of the data (user data) can be performed with high accuracy by positioning the recording / reproducing head 12 using the third servo patterns 64a to 64c. Further, since the third servo patterns 64a to 64c are recorded in the magnetic disk device 100, the cost spent on the external STW equipment can be reduced.

  In this embodiment, since the system area 62 is provided so as to extend in the radial direction of the magnetic disk 18, data that can be recorded in the system area 62 while securing an area for recording the third servo pattern. It is possible to secure a large amount.

  In the above embodiment, the case where the first servo pattern 34 and the system area 62 are provided in the inner peripheral area of the magnetic disk 18 has been described. However, the present invention is not limited to this. For example, as shown in FIG. 11, the magnetic disk 18 may be provided in a region on the outer peripheral side. Also in this case, by arranging the first servo pattern 34, the second servo pattern 36, and the system area 62 along the circumferential direction in a predetermined area on the outer circumferential side (range B in the radial direction in FIG. 11), As shown in FIG. 12, the third servo patterns 64a, 64b, and 64c can be formed in the same manner as in the above embodiment. Not limited to this, the first servo pattern 34 and the system area 62 may be provided on both sides of the inner peripheral area and the outer peripheral area.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

12 Recording / reproducing head 18 Magnetic disk (recording medium)
34 First servo pattern 36 Second servo pattern 56 Recording signal generator 62 System area 64a to 64c Third servo pattern 90 Disc substrate (recording medium body)
100 Magnetic disk device (information storage device)

Claims (7)

A disc-shaped recording medium body;
A first servo pattern having absolute position information on the recording medium body;
A second servo pattern having relative position information on the recording medium body;
A system area for storing data used when recording a third servo pattern having absolute position information on the recording medium main body using the first and second servo patterns;
The recording in which the first servo pattern, the second servo pattern, and the system area are arranged along a circumferential direction in at least one of an outer peripheral portion and an inner peripheral portion of the recording medium main body. Medium.   The recording medium according to claim 1, wherein the system area extends in a radial direction of the recording medium main body.   3. The recording medium according to claim 1, wherein a servo sync mark of the first servo pattern is different from a servo sync mark of the third servo pattern recorded on the recording medium main body. After the third servo pattern is recorded,
The third servo pattern, the first and second servo patterns, and the system area are arranged along the circumferential direction in at least one of the outer peripheral portion and the inner peripheral portion of the recording medium body. The recording medium according to claim 1, wherein the recording medium is a recording medium. The recording medium according to any one of claims 1 to 4,
A recording / reproducing head for recording / reproducing information on the recording medium;
Control for recording the third servo pattern on the recording medium using the recording / reproducing head based on the information of the first and second servo patterns and the data stored in the system area An information storage device comprising: a recording signal generation unit that generates a signal. The recording signal generator is
When reading and writing information to the system area, open the servo gate to cover the outside of the system area,
6. The information storage device according to claim 5, wherein after completion of the reading and writing, the servo gate is opened so as to cover only an area where the first servo pattern is arranged. Connected to an information storage device comprising: the recording medium according to any one of claims 1 to 4; and a recording / reproducing head for recording / reproducing information on the recording medium;
Control for recording the third servo pattern on the recording medium using the recording / reproducing head based on the information of the first and second servo patterns and the data stored in the system area A control device for generating a signal.

Images