JP2010165412A - Information storage device and servo pattern recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately perform rewriting formation of a third servo pattern. <P>SOLUTION: Since processing for determining the range on an outer peripheral side where a recording and playback head can perform reading and writing using a first servo pattern is executed (steps S10, S11, S17 and S18) when the first servo pattern (outer peripheral side) exists in a recording medium and a range where the recording and playback head on an inner peripheral side can perform reading and writing using the first servo pattern is determined (step S12) when the first servo pattern (inner peripheral side) exists on the inner peripheral side of the recording medium, the range for recording a third servo pattern can be suitably set. Thereby, rewriting formation of the third servo pattern can be accurately performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information storage device and a servo pattern recording method, and in particular, forms a new servo pattern using a servo pattern previously formed on a storage medium, and executes recording / reproduction based on the new servo pattern. The present invention relates to an information storage device and a servo pattern recording method suitable for use in 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.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof 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 servo pattern recording method capable of forming a servo pattern with high accuracy.

  An information storage device described in the present specification is a disk-shaped disk in which a first servo pattern having absolute position information on a recording surface and a second servo pattern having relative position information on the recording surface are formed. When there is a recording medium, a recording / reproducing head for recording / reproducing information to / from the recording medium, and a first servo pattern on the outer peripheral side of the recording medium, the outer peripheral side is used by using the first servo pattern. A first range determination process for determining a range in which the recording / reproducing head can read and write, and when the first servo pattern exists on the inner periphery side of the recording medium, the inner periphery using the first servo pattern A second range determination process for determining a range in which the recording / reproducing head on the side can read and write, a range determination unit that executes at least one of the ranges, and a range determined by the range determination unit, A control signal for recording a third servo pattern having an absolute position on the recording surface on the recording medium using the recording / reproducing head based on the information of the first and second servo patterns. And a recording signal generation unit that generates the information storage device.

  According to this, when the first servo pattern is present on the outer peripheral side of the recording medium, the process of determining the outer peripheral side range in which the recording / reproducing head can read and write using the first servo pattern (the first servo pattern) Range determination process), the recording / reproducing head and the member that holds the recording / reproducing head may be replaced with another member (for example, a lamp member) while the recording / reproducing head is recording the third servo pattern. Inadvertent contact can be suppressed. Further, when the first servo pattern exists on the inner peripheral side of the recording medium, a process for determining a readable / writable range by the inner recording / reproducing head using the first servo pattern (second range) The recording / reproducing head and the member holding the recording / reproducing head are not prepared for other members (for example, an inner stopper) while the recording / reproducing head is recording the third servo pattern. Can be prevented from touching. Therefore, by executing any one of the above processes, it is possible to suppress the failure of the recording / reproducing head, the member holding the recording / reproducing head or other members, and to record the third servo pattern with high accuracy. Furthermore, if both the first and second range determination processes are executed, the range for recording the third servo pattern can be set appropriately, so that the third servo pattern can be recorded with higher accuracy. Can do. As described above, according to the information storage device described in the present specification, the third servo pattern can be recorded with high accuracy, so that the recording / reproducing head can be moved by using the third servo pattern. It is possible to record or reproduce information (user data) with high accuracy.

  The servo pattern recording method described in the present specification is a disc-like shape in which a first servo pattern having absolute position information on a recording surface and a second servo pattern having relative position information on the recording surface are formed. A first range determining process for determining a range in which the recording / reproducing head on the outer peripheral side can read and write using the first servo pattern when the first servo pattern is present on the outer peripheral side of the recording medium; Second range determination processing for determining a range in which the recording / reproducing head on the inner circumference side can read and write using the first servo pattern when the first servo pattern exists on the inner circumference side of the recording medium And a range determination step for executing at least one of the first and second servo patterns within the range determined in the range determination step. A recording step of recording third servo pattern having an absolute position, a servo pattern recording method comprising.

  According to this, when the first servo pattern is present on the outer peripheral side of the recording medium, the process of determining the outer peripheral side range in which the recording / reproducing head can read and write using the first servo pattern (the first servo pattern) Range determination process), the recording / reproducing head and the member that holds the recording / reproducing head may be replaced with another member (for example, a lamp member) while the recording / reproducing head is recording the third servo pattern. Inadvertent contact can be suppressed. Further, when the first servo pattern exists on the inner peripheral side of the recording medium, a process for determining a readable / writable range by the inner recording / reproducing head using the first servo pattern (second range) The recording / reproducing head and the member holding the recording / reproducing head are not prepared for other members (for example, an inner stopper) while the recording / reproducing head is recording the third servo pattern. Can be prevented from touching. Therefore, by executing any one of the above processes, it is possible to suppress the failure of the recording / reproducing head and the like and to record the third servo pattern with high accuracy. Furthermore, if both the first and second range determination processes are executed, the range for recording the third servo pattern can be set appropriately, so that the third servo pattern can be recorded with higher accuracy. Can do.

  The information storage device described in this specification has an effect that information can be recorded and reproduced with high accuracy. In addition, the servo pattern recording method described in this specification has an effect that a highly accurate servo pattern can be recorded.

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 outer peripheral side of the magnetic disk of FIG. 2. 1 is a plan view of a magnetic disk device. 12 is a flowchart (part 1) illustrating a process from a process of setting a rewrite formation range of a third servo pattern to a process of forming a third servo pattern. FIG. 6A is a diagram showing the lamp end position, and FIG. 6B is a diagram showing the lamp calibration cylinder. It is a figure shown about a rewrite formation inner cylinder. It is a figure shown about a spiral reference position initial stage cylinder. It is a figure shown about a rewrite formation outer cylinder. 12 is a flowchart (part 2) illustrating a process from a process for setting a rewrite formation range of a third servo pattern to a process for forming a third servo pattern. It is a figure for demonstrating the formation method of a 3rd servo pattern.

  Hereinafter, an embodiment of an information storage device and a servo pattern recording method according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 shows a block diagram of a magnetic disk device 100 as an information storage device 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 has a head amplifier 10, a recording / reproducing head 12, a voice coil motor 14, a spindle motor 16, and a magnetic disk 18 as a recording medium.

  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 (outer peripheral side) 34A provided at predetermined intervals along the circumferential direction in the region near the outer peripheral portion of the disk substrate 190, and the inner periphery of the disk substrate 190. First servo pattern (inner circumferential side) 34B provided at predetermined intervals along the circumferential direction and a spiral (secondary) second servo provided on the entire surface of the disk substrate 190 in the region near the portion. And a pattern 36.

  In this 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 34A are recorded. , 34B, 36 are used for positioning the recording / reproducing head 12 in this recording. The first servo patterns 34A and 34B 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 magnetic disk 18. The first servo patterns 34A and 34B extend in the radial direction of the magnetic disk 18, as shown in FIG. That is, the first servo patterns 34 </ b> A and 34 </ b> B are provided radially from the outside or the inside of the magnetic disk 18.

  The first servo patterns 34A and 34B actually include a preamble, a servo sync mark, sector data, a gray code, and a phase burst. As described above, in the present embodiment, since the first servo patterns 34A and 34B include a gray code or the like, the recording / reproducing head 12 reads the first servo patterns 34A and 34B, so The absolute position at can be specified. That is, it can be said that the first servo patterns 34 </ b> A and 34 </ b> B include absolute position information on the magnetic disk 18.

  On the other hand, the second servo pattern 36 has a spiral shape (spiral shape), and is in a state of intersecting the first servo patterns 34A and 34B. The second servo pattern 36 includes a sync mark and a burst. 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 FIGS. 2 and 3, a system region 62 is provided at a position adjacent to the first servo pattern (outer peripheral side) 34A. The system area 62 stores schedule data for recording a third servo pattern, which will be described later, a rewrite forming inner cylinder, a rewriting forming outer cylinder, and the like.

  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 flash ROM may record schedule data for recording the third servo pattern instead of the system area 62 on the magnetic disk 18 described above.

  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 comprehensively controls the entire magnetic disk device 100. As illustrated in FIG. 1, the MPU 30 includes a head position control unit 54, a range determination unit 53, a cylinder calculation unit 55, and a recording signal generation unit 56. 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 range determination unit 53 determines a range (a range in the radial direction of the magnetic disk 18) for recording the third servo pattern. The cylinder calculation unit 55 calculates how many cylinders can be formed within the range determined by the range determination unit 53. 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.

  FIG. 4 shows a plan view of the magnetic disk device 100. As shown in FIG. 4, a ramp member 17 is provided in the vicinity of the outer periphery of the magnetic disk 18. The ramp member 17 is a member that holds (instructs) the recording / reproducing head 12 unloaded outside the magnetic disk 18. The lamp member 17 is fixed to the housing by screwing or the like. The length of the ramp member 17 protruding onto the magnetic disk 18 differs depending on the apparatus depending on the accuracy of forming the ramp member 17 itself and the fixed position error of the ramp member 17.

  As shown in FIG. 4, an inner stopper 19 that defines the end of the movable range of the HSA 11 is provided in the vicinity of the head stack assembly (HSA) 11 that holds the recording / reproducing head 12. The inner stopper 19 is provided at a position in contact with the HSA 11 when the recording / reproducing head 12 is located on the innermost circumference of the magnetic disk 18 (indicated by a broken line in FIG. 4). However, if the spindle motor 16 is shaken or eccentric when the magnetic disk 18 is assembled, the HSA 11 is connected to the inner stopper 19 even though the recording / reproducing head 12 is not located on the innermost circumference. May come into contact.

  Next, processing from setting of the third servo pattern recording range to formation of the third servo pattern will be described in detail with reference to the flowcharts of FIGS.

  First, the MPU 30 (range determination unit 53) executes lamp position calibration using the first servo pattern (outer peripheral side) 34A in step S10 of FIG.

  Specifically, the range determination unit 53 first unloads the recording / reproducing head 12 by supplying a specified current to the voice coil motor 14 from the unload cylinder position on the magnetic disk 18. Here, the unload cylinder position is a position defined in advance, and can be detected based on the first servo pattern (outer peripheral side) 34A. The range determination unit 53 controls the speed of the recording / reproducing head 12 while monitoring the back electromotive force of the voice coil motor 14 while the recording / reproducing head 12 is unloaded. Then, the range determining unit 53 detects the position where the recording / reproducing head 12 is transferred from the magnetic disk 18 to the lamp member 17 (that is, the end of the lamp) based on the current change of the voice coil motor 14, and The position is set as the lamp end position (see FIG. 6A).

  Next, the MPU 30 (range determination unit 53) sets a lamp calibration cylinder in step S11 of FIG. Here, the lamp calibration cylinder is a position shifted radially inward from the lamp end position obtained in step S10 by a distance (L1) shown in FIG. The distance L1 is a predetermined distance in consideration of device characteristics and the like.

  Next, the MPU 30 (range determination unit 53) executes inner stopper position calibration using the first servo pattern (inner peripheral side) 34B in step S12 of FIG.

  Specifically, the range determination unit 53 first causes the recording / reproducing head 12 to be on-track near the innermost periphery of the first servo pattern (inner periphery side) 34B. Next, the range determination unit 53 supplies the constant current to the voice coil motor 14 while monitoring the gray code of the first servo pattern (inner peripheral side) 34B, and moves the recording / reproducing head 12 in the inner peripheral direction. . Then, the range determination unit 53 detects a position where the gray code does not change (gray code cylinder position) while the recording / reproducing head 12 is moving. This Gray code cylinder position is a position where the HSA 11 and the inner stopper 19 come into contact with each other. The range determination unit 53 sets the gray code cylinder position as a stopper calibration cylinder (see FIG. 7).

  Next, the MPU 30 (range determination unit 53) stores the stopper calibration cylinder in the system area 62 in step S13.

  Next, in step S14, the MPU 30 (range determination unit 53) reads the lamp calibration cylinder stored in step S11 and the stopper calibration cylinder stored in step S13 from the system area 62. .

Next, in step S15, the cylinder calculation unit 55 calculates the number of formable cylinders according to the following equation (1). Note that the stopper calibration cylinder (SCS) is larger than the lamp calibration cylinder (RCS).
Number of cylinders that can be formed = SCS-RCS (1)

  Next, in step S16, the cylinder calculating unit 55 determines whether or not the number of formable cylinders calculated by the above equation (1) is equal to or greater than a predetermined necessary number of cylinders. If the determination here is negative, the required number of cylinders cannot be secured, and the entire process is terminated without performing the subsequent processes. On the other hand, when judgment here is affirmed, it transfers to step S17.

  Next, the MPU 30 (range determination unit 53) sets a spiral reference position initial cylinder based on the lamp calibration cylinder in step S17. Here, as shown in FIG. 8A, the spiral reference position initial cylinder is a position shifted outward from the lamp calibration cylinder by a distance (L2). Here, the distance (L2) is, as shown in FIG. 8 (b), the number of cylinders that guarantees variation in the eccentricity of the magnetic disk 18 by the number of cylinders that guarantees measurement variation in the ramp position calibration (step S10). This is the distance obtained by adding the number of cylinders necessary for searching the spiral reference position (described later). Each of these values is a predetermined value.

  Next, in step S18, the MPU 30 (range determining unit 53) executes a search from the spiral reference position initial cylinder inward in the radial direction to set the spiral reference position. The spiral reference position is a position at which the timing for detecting the second servo pattern 36 becomes a predetermined timing.

  Next, the MPU 30 (range determining unit 53) stores the spiral reference position in the system area 62 as a rewrite-formed outer cylinder in step S19.

  Next, the MPU 30 (range determination unit 53) reads out the rewrite forming outer cylinder and the stopper calibration cylinder from the system area in step S20.

  In step S21, the MPU 30 (range determining unit 53) uses the stopper calibration cylinder as a rewrite formation inner cylinder, creates a rewrite formation schedule using the rewrite formation inner cylinder and the rewrite formation outer cylinder, and creates a system area. 62 is stored. That is, a rewrite formation schedule for writing the third servo pattern is created and stored in a range starting from the rewrite formation outer cylinder and ending with the rewrite formation inner cylinder. In this schedule, information (schedule data) such as the number of rewrites that need to be executed to form the third servo pattern, the cylinder position in each rewrite, and the like are defined. In the present embodiment, a case where the third servo pattern 64 (see FIG. 11) is formed by one rewrite formation will be described as an example.

  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. 10, and controls the recording / reproducing head 12 in the first servo pattern 34. Position on the target track. In this case, it is possible to position the recording / reproducing head 12 on the target track by using information such as the gray code and phase burst of the first servo pattern 34.

  Next, the MPU 30 reads the position information of the rewrite forming outer cylinder in step S32. Further, the MPU 30 reads the rewrite formation schedule data recorded in the system area 62 in step S34.

  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 in step S38, and moves the recording / reproducing head 12 onto the rewrite-formed outer cylinder read from the system area 62. In this movement, the MPU 30 (head position control unit 54) uses information such as the gray code and phase burst of the first servo pattern 34.

  Next, the MPU 30 (head position control unit 54) changes the positioning control of the recording / reproducing head 12 from positioning control using the first servo pattern 34 to positioning control using the second servo pattern 36 in step S40. Change. Then, 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 this embodiment, only one rewrite formation is performed, and the rewrite formation start position is the above-described rewrite formation outer cylinder. Therefore, the recording / reproducing head 12 is not moved in step S42. However, in step S42 in the second and subsequent processes when the rewrite formation is performed in a plurality of times, the vicinity of the end position in the rewrite formation performed before that is set as the rewrite formation start position.

  Next, the MPU 30 (head position control unit 54) drives the spindle motor 16 and the voice coil motor 14 via the servo controller 26 based on the cylinder position information in the rewrite formation schedule read from the system area 62 in step S44. Then, 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 64 in step S46. A recording signal for rewriting the third servo pattern 64 is transmitted to the recording / reproducing head 12 via the read channel 28. Accordingly, as shown in FIG. 12, the third servo pattern 64 is formed at a position shifted in the circumferential direction with respect to the first servo pattern 34 and the system area 62 (step S48). When the third servo pattern 64 is formed on the magnetic disk 18, the recording / reproducing head 12 is moved in the radial direction with respect to the rotating magnetic disk 18 (moving at a predetermined feed pitch). , Formed sequentially for each sector. Then, when reaching the rewrite forming inner cylinder, the formation of the third servo pattern 64 is completed.

  Here, as described above, the second servo pattern 36 has relative position information on the magnetic disk 18, and the second servo pattern 36 on the rewrite-formed outer cylinder has absolute position information. Therefore, the positioning control of the recording / reproducing head 12 is executed from the second servo pattern 36 on the rewrite-formed outer cylinder, and thereafter, the absolute position on the magnetic disk 18 is determined by using the second servo pattern 36. The positioning control of the recording / reproducing head 12 can be performed while specifying.

  Next, the MPU 30 (head position control unit 54) stops positioning control using the second servo pattern 36 and unloads the recording / reproducing head 12 outside the magnetic disk 18 in step S50.

  Next, in step S52, the MPU 30 (head position control unit 54) uses the information such as the gray code and the phase burst of the first servo pattern 34 again to move the recording / reproducing head 12 to the target in the first servo pattern 34. Position on the 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 rewrite formation in the system area 62, and returns to step S34.

  Next, the MPU 30 reads the rewrite formation schedule data and the information on the completion of the rewrite formation from the system area 62 (step S34), and determines whether the rewrite formation schedule has 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 rewrite formation, the determination in step S36 is affirmed and the process proceeds to step S56. .

  Then, in step S56, the MPU 30 records that all the rewrite formations are completed in the system area 62, and ends all the processes in FIG.

  As described above, after the third servo pattern 64 is formed, the process proceeds to a shipping stage through a test process and the like. After the shipment, the MPU 30 performs recording / reproduction of information (user data) with respect to the magnetic disk 18 while controlling the position of the recording / reproducing head 12 based on the third servo pattern 64.

  As described above in detail, according to the present embodiment, the range determination unit 53 can read / write the recording / reproducing head 12 using the first servo pattern (outer peripheral side) 34A existing on the outer peripheral side of the magnetic disk 18. Since the process of determining the outer peripheral side range (rewrite forming outer cylinder) is executed, a member positioned on the outer peripheral side of the magnetic disk 18 (for example, while the recording / reproducing head 12 is recording the third servo pattern 64). It is possible to suppress the recording / reproducing head 12 from coming into contact with the lamp member 17). In this case, even if the length of the ramp member 17 protruding onto the magnetic disk 18 due to the formation accuracy of the ramp member 17 or the fixing position error of the ramp member 17 is different for each apparatus, contact can be suppressed without any problem. It is. Further, for example, even when a plurality of recording / reproducing heads are provided, it is possible to suppress contact without being affected by variation in the caulking angle of the HSA 11 that holds each recording / reproducing head 12. In the present embodiment, the range determination unit 53 can read and write the read / write head 12 on the inner circumference side using the first servo pattern (inner circumference side) 34 </ b> B existing on the inner circumference side of the magnetic disk 18. Since the process of determining the (rewrite forming inner cylinder) is executed, the HSA 11 is prevented from inadvertently coming into contact with the inner stopper 19 while the recording / reproducing head 12 is recording the third servo pattern 64. be able to. In this case, it is possible to suppress the contact without causing any problem even if the spindle motor 16 is shaken or eccentricity occurs when the magnetic disk 18 is assembled. Therefore, in the present embodiment, the range for recording the third servo pattern 64 can be appropriately set by executing both the above-described processes, and therefore the third servo pattern 64 is recorded with high accuracy (rewrite formation). can do. Further, since the third servo pattern 64 can be recorded (rewrite formation) with high accuracy, information (user data) can be recorded by controlling the movement of the recording / reproducing head 12 using the third servo pattern 64. Alternatively, reproduction can be performed with high accuracy.

  Further, since the rewrite forming outer cylinder and the rewrite forming inner cylinder are set for each apparatus, the rewriting formation of the third servo pattern 64 can be appropriately executed in each apparatus.

  In the present embodiment, the cylinder calculating unit 55 calculates the number of cylinders that can be formed between the rewrite-formed outer cylinder and the rewrite-formed inner cylinder, so that the magnetic disk 18 is recorded before the third servo pattern 64 is recorded. The number of cylinders can be specified. Further, in this embodiment, when the number of cylinders does not reach the required number of cylinders, rewrite formation of the third servo pattern 64 is not executed, so that it is expected that the desired magnetic disk 18 cannot be obtained. In this case, it is possible to improve work efficiency by not executing rewrite formation in advance.

  In the above embodiment, the case where the lamp calibration cylinder, the spiral reference position initial cylinder, and the spiral reference position (rewrite forming outer cylinder) are sequentially determined based on the lamp end position has been described. However, the present invention is not limited to this. Absent. For example, the spiral reference position (rewrite forming outer cylinder) may be determined directly on the basis of the lamp end position. For example, the spiral reference position (rewrite forming outer cylinder) may be determined on the basis of the lamp calibration cylinder. Also good.

  Moreover, although the said embodiment demonstrated the case where a stopper calibration cylinder was used as a rewrite formation inner cylinder, not only this but the new position determined based on a stopper calibration cylinder is set as a rewrite formation inner cylinder. It's also good.

  In the above embodiment, a case has been described in which the rewrite forming outer cylinder and the rewrite forming inner cylinder are set, and the rewrite forming schedule of the third servo pattern 64 is determined based on these values. Not limited to this, only one of the rewrite formation outer cylinder and the rewrite formation inner cylinder may be determined, and the rewrite formation schedule of the third servo pattern 64 may be determined based on the value. Even in this case, it is possible to suppress the contact between the recording / reproducing head 12 and the lamp member 17 or the contact between the HSA 11 and the inner stopper 19.

  In the above embodiment, the case where the third servo pattern 64 is formed by one rewrite formation has been described. However, the present invention is not limited to this, and the third servo pattern is formed by a plurality of rewrite formations. Also good.

  In the above embodiment, the case where the third servo pattern 64 is formed with the rewrite-formed outer cylinder as the start point and the rewrite-formed inner cylinder as the end point has been described. However, the present invention is not limited thereto, and the rewrite-formed inner cylinder is set as the start point. The third servo pattern 64 may be formed with the forming outer cylinder as an end point.

  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)
34A, 34B First servo pattern 36 Second servo pattern 53 Range determination unit 55 Cylinder calculation unit 56 Recording signal generation unit 64 Third servo pattern 100 Magnetic disk device (information storage device)

Claims (6)

A disc-shaped recording medium on which a first servo pattern having absolute position information on the recording surface and a second servo pattern having relative position information on the recording surface are formed;
A recording / reproducing head for recording / reproducing information on the recording medium;
A first range determination process for determining a range in which the recording / reproducing head on the outer peripheral side can read and write using the first servo pattern when the first servo pattern exists on the outer peripheral side of the recording medium; Second range determination processing for determining a range in which the recording / reproducing head on the inner circumference side can read and write using the first servo pattern when the first servo pattern exists on the inner circumference side of the recording medium A range determining unit that executes at least one of
A third servo pattern having an absolute position on the recording surface based on the information of the first and second servo patterns within the range determined by the range determination unit is recorded using the recording / reproducing head. An information storage device comprising: a recording signal generation unit that generates a control signal for recording on the recording medium. The range determining unit
In the first range determination process, a position of a ramp member that supports the recording / reproducing head provided in the vicinity of the outer peripheral portion of the recording medium is detected, and a range in which the recording / reproducing head can read and write based on the position is detected. Determine the outer edge of the
In the second range determination process, the position where the recording / reproducing head contacts the inner stopper that restricts the movement of the recording medium to the inner periphery side is detected, and the recording / reproducing head reads / writes based on the position. 2. The information storage device according to claim 1, wherein an end portion on an inner peripheral side of a possible range is determined. When the range determination unit executes both the first range determination process and the second range determination process,
The information storage device according to claim 1, further comprising a cylinder calculation unit that calculates the number of cylinders that can be formed within the range determined by each of the processes. When the calculation result by the cylinder calculation unit does not exceed a predetermined number of cylinders,
4. The information storage device according to claim 3, wherein the recording signal generation unit does not generate a control signal for causing the recording / reproducing head to record the third servo pattern. A first servo pattern on the outer peripheral side of a disc-shaped recording medium on which a first servo pattern having absolute position information on the recording surface and a second servo pattern having relative position information on the recording surface are formed When the recording / reproducing head on the outer circumference side uses the first servo pattern, the first servo area is determined on the inner circumference side of the recording medium. A range determination step for executing at least one of a second range determination process for determining a range in which the recording / reproducing head on the inner circumference side can read and write using the first servo pattern when a pattern exists; ,
And a recording step of recording a third servo pattern having an absolute position on the recording surface based on the information of the first and second servo patterns within the range determined in the range determination step. Servo pattern recording method. A calculation step of calculating the number of cylinders that can be formed within the range determined in each of the processes when both the first range determination process and the second range determination process are executed in the range determination step; ,
A determination step of determining whether the number of cylinders calculated in the calculation step is equal to or greater than a predetermined number of cylinders;
6. The servo pattern recording method according to claim 5, wherein if the determination in the determination step is negative, the recording step is not performed.

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