WO2000031738A1 - Lecteur de disque, son procede de production, et controleur de lecteur de disque - Google Patents
Lecteur de disque, son procede de production, et controleur de lecteur de disque Download PDFInfo
- Publication number
- WO2000031738A1 WO2000031738A1 PCT/JP1999/002422 JP9902422W WO0031738A1 WO 2000031738 A1 WO2000031738 A1 WO 2000031738A1 JP 9902422 W JP9902422 W JP 9902422W WO 0031738 A1 WO0031738 A1 WO 0031738A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording
- reproducing
- calculation
- disk drive
- disk
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000010354 integration Effects 0.000 claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 19
- 230000008859 change Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 101100341170 Caenorhabditis elegans irg-7 gene Proteins 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/08—Track changing or selecting during transducing operation
- G11B21/081—Access to indexed tracks or parts of continuous track
- G11B21/083—Access to indexed tracks or parts of continuous track on discs
- G11B21/085—Access to indexed tracks or parts of continuous track on discs with track following of accessed part
Definitions
- Disk drive device and manufacturing method thereof, disk drive control device
- the present invention relates to a disk drive device, a method of manufacturing the same, and a disk drive control device.
- concentric recording tracks X2 are formed on the recording surface of a magnetic disk xl used as a recording medium in a disk drive device.
- the recording track X2 is provided with a servo area X3 in which servo sectors including servo patterns, IDs, etc. are recorded at predetermined angles (for example, 360; Z80), and between adjacent servo areas X3.
- Is provided with a data area X4 in which a data sector X5 is recorded.
- Some disk drive devices divide the data area X4 into several areas (zones) in the radial direction, and for each zone, a number of data sectors X5 corresponding to the radial position. By recording, the recording density is made uniform.
- servo patterns WEDGE-A, WE DGE-B, WEDGE-C, WEDGE-D
- ID CYL ID
- a seek (movement) of moving the head X6 to a track (target track) in which a sector instructed to be recorded or played back is recorded (target track) is performed. Seek) control, and after head X6 reaches the target track, track following control to adjust the position of head X6 so that head X6 follows the track. And perform recording / reproducing on a predetermined sector.
- the HDC / MPUx 9 calculates an error (position error) from the target track from the current position of the head X6 based on the reproduction output of the servo pattern described above. Further, the HDC / MPU X9 executes control according to the position error.
- the HDCZMPUx 9 first executes control for accelerating the head X6 toward the target sector. Next, when the moving speed of the head X6 reaches a predetermined speed, the HDC / MPUx9 executes control for moving the head X6 at a constant speed. Finally, when the head X 6 reaches the vicinity of the target sector, a control (settling control) for decelerating the head Fx 6 is executed.
- HDCZMPUx9 switches to track following control in which head X6 follows the target track. Switching of these controls is performed by changing the parameters of the calculation for obtaining the servo data.
- HDC / MPU X9 obtaining servo data for driving a voice coil motor (VCM) X8 that moves a head arm X7 based on a position error. ing.
- VCM voice coil motor
- the calculation of the servo data is, for example, according to the following equation (1). It includes the integration parameter I from the viewpoint of control stability and the like.
- the disk drive device will be regarded as defective and the yield will be reduced.
- the present invention has been made in view of the above-described problems, and provides a disk drive device, a manufacturing method thereof, and a disk drive control device capable of improving the yield without unnecessarily increasing the cost.
- Disclosure of the invention is to: Disclosure of the invention
- a seek error detecting means for detecting that a seek for moving the recording / reproducing means to a target position in accordance with a calculation result by the calculating means has failed; and a seek error detecting means for detecting a seek failure.
- a resetting means for setting the integration parameter again may be provided.
- a method for manufacturing a disk drive device is a method for manufacturing a disk drive device according to the present invention, wherein recording and reproducing means are provided at all radial positions used for recording on a disk-shaped recording medium. It is characterized by calculating the integral parameters for each radial position by moving it, and adjusting the integral parameters to a value within the operational accuracy when the integral parameters have a value higher than the operational accuracy of the arithmetic means.
- FIG. 1 is a block diagram showing a configuration of a disk drive device according to an embodiment of the present invention
- FIG. 2 is a block diagram showing the configuration of a conventional disk drive device
- FIG. 3 is a diagram showing an example of a format of a service sector used in a disk drive device.
- FIG. 4 is a perspective view showing a detailed configuration of the disk drive device according to one embodiment of the present invention.
- FIG. 5 is a diagram showing an operation mode in a seek operation of the disk drive device
- FIG. 6 is a diagram showing an example of an integration parameter used for obtaining surrogate data in a disk drive device.
- FIG. 7 is a diagram showing another example of the integration parameter.
- FIG. 8 is a flowchart showing the adjustment processing of the integration parameter.
- FIG. 1 is a perspective view showing the configuration of the disk drive device according to the first embodiment of the present invention.
- This disk drive device is arranged close to a magnetic disk 1, a head 2 for performing recording / playback on the magnetic disk 1, a head arm 3 to which the head 2 is attached, and a head 2.
- An arm electronic circuit (AE) 4 for supplying a recording signal to the head 2 and picking up (amplifying) the reproduction output of the head 2, a servo pattern from the reproduction output supplied via the AE 4, and a cylinder ID ( Channel 5 for extracting CYL ID), encoding method conversion, etc., control IC 10 for servo control, recording / reproduction control for magnetic disk 1, etc., and voice coil motor (VCM) for moving head arm 3 ) To drive the VCM.
- VCM voice coil motor
- the control IC 10 includes an MPU 12 for controlling the operation of the entire apparatus, a ROM 13 for storing control programs, a RAMI 4 used for storing control data, recording / reproducing data, and a servo signal.
- To form H It has a DC (hard disk controller) 20, an MPU 12, a ROM 13, a RAMI 4, a path 21 to which the HDC 20 is connected, and the like, and is configured as, for example, a single semiconductor element.
- FIG. 4 is a perspective view showing a specific configuration of the disk drive device.
- the magnetic disk 1 is rotatably mounted on the chassis 15 .
- a head arm 3 that drives a head slider to which the head 2 is mounted moves the head 2 in a substantially radial direction of the magnetic disk 1. Mounted and driven by VCM16.
- the rotation of the head 17 is restricted by the magnet 17 at a position opposite to the landing zone provided on the circumferential side of the magnetic disk 1.
- the above-described AE 4 is attached to the side of the head arm 3 for noise reduction and the like, and is connected to the head 2 and the channel 5 by a flexible cable 18.
- the control IC 10 described above is mounted on a control board (not shown) mounted outside the chassis 15, and penetrates the chassis 15 and is connected by a flexible cable 18.
- tracks X2 of a predetermined width are formed concentrically. Further, a servo area is provided on the recording surface at every predetermined angle (for example, 360 ° / 80), and a servo pattern X3 is recorded in this servo area.
- a data sector X5 is recorded in an area (data area) X4 between adjacent servo patterns X3 on each track X2.
- the data area X4 is divided into several areas (zones) in the radial direction, and the number of data sectors X5 corresponding to the radial position in each zone is recorded, thereby achieving a uniform recording density. You can try it.
- each servo sector x 3 has a cylinder ID (CYL ID) indicating a track number, a physical sector number (SECCNT) indicating a servo pattern number, and a tracking (forging) control.
- Burst patterns WEDGE-A, WEDGE-B, WEDGE-C, WEDGE-D), etc. are encoded and recorded by an encoding method suitable for each recording Z reproduction.
- CYL ID is recorded in a special notation called Gray code. This notation is different from the usual binary notation, and is defined so that only one place of the bit pattern changes with each increment of the value. With this notation, either value is always obtained even if the head flies between cylinders n and n-1.
- the SECCNT is a number for identifying each servo pattern. This number does not change even if its position in the radial direction is different, so it is recorded in binary format.
- Channel 5 reproduces CYL ID and SECCNT by decoding corresponding to these encodings, and supplies it to the control IC 10.
- the burst patterns (WEDGE-A, WEDGE-B, WEDGE-C, WEDGE-D) detect the detailed position on the track, remove the uncertainty of the CYL ID as described above, and Is recorded to determine on which adjacent track the track is located.
- Each burst pattern is composed of a burst pattern having a width corresponding to a track pitch having two tracks as one cycle, and is recorded so that recording positions in the radial direction are different from each other by half the track pitch.
- the playback output of Head 2 will show CYL ID, SECCNT, WEDGE-A, WEDG E-B, WEDGE-C, and WEDG E-D in this order. These playback outputs are It is.
- the playback levels of these burst patterns WEDGE-A, WEDGE-B, WEDGE-C, and WEDGE-D change according to the position of Head2.
- Channel 5 has an AD converter (ADC) 5a.
- the ADC 5a sequentially performs AD conversion on the reproduction level of each burst pattern (WEDGE-A, WEDGE-B, WEDGE_C, WEDGE-P). It is output as data (A, B, C, D) indicating the playback level of each perspective pattern.
- the HDC 20 performs control such as generation of a control signal for channel 5, search of a servo pattern, generation of a CYL ID from a gray code reproduction output, and drive control based on control from the MPU 12, as described above. Detection of the current position of head 2 based on data A, B, C, and D indicating the playback level of each servo pattern supplied from ADC 5a, seek control to move head 2 to the target track, head Execute track following control to make 2 follow the target track.
- the MPU 12 executes, for example, a control program recorded in the ROM 13 to execute input / output control of commands and data with external devices, exception processing that cannot be processed by the HDC 20, and the like.
- a target track, a target sector, and the like are obtained from the specified LBA.
- the HDC 20 first executes control for accelerating the head 2 toward the target sector as shown in FIG. You.
- a mode for performing a series of these speed controls is referred to as a speed control mode.
- a mode in which such control is performed is referred to as a settling mode.
- a mode for performing such control is referred to as a track following mode.
- the HDC 20 obtains the current position of head 2 and The position and position error information (PES: Position Error Signal) from the target track obtained as described above are obtained.
- PES Position Error Signal
- the HDC 20 selects one of the above-described modes according to the value of PES, and calculates servo data according to the selected mode.
- the calculation for obtaining the servo data (U (t)) is performed, for example, according to the following equation (1).
- X (t) in the first term on the right-hand side corresponds to the distance from the target track, that is, PES described above
- X (t) in the second term on the right-hand side t) -X (t -1) indicates the time change of the PES, that is, the speed of the head 2.
- I in the fifth term on the right-hand side is an integration parameter (sample of X (integral value where X is an integral variable)
- C in the sixth term on the right-hand side is a constant.
- Kl, ⁇ 2, ⁇ 3, K4 and K5 are feedback gains, which are determined in consideration of control gain, stability, etc.
- the integration parameter I is a parameter for correcting the DC bias current supplied to the VCM when the position of the head 2 is held on a fixed track.
- the optimum value for track following is determined by actual measurement during manufacturing.
- Figure 6 shows an example of the integration parameter I obtained experimentally.
- the left side in FIG. 6 shows the outer peripheral side of the magnetic disk 1
- the right side in FIG. 6 shows the inner peripheral side of the magnetic disk 1.
- the value of the integral parameter I changes depending on, for example, the interaction with the magnet 17 described above, the elasticity of the flexible cable 18, the airflow received by the head slider, and the like. For this reason, it differs between devices having different structures such as the number of disks and the number of heads, or between devices having the same structure due to variations in components.
- the value of I may be negative on the inner peripheral side of the magnetic disk 1 as shown in FIG.
- the value of the integration parameter I is limited by the calculation accuracy of HDC. You. For example, with 16-bit precision, the value of I is limited to values from 8000h (h indicates a hexadecimal number) to 7FFFh (1 3276 8 to 32767). Further, in consideration of a margin for performing the correction, in this case, the value of I is limited to about 15,000 to 25,000.
- the value of I is within the calculation range of HDC 20 for all tracks, and the DC bias of VCM can be corrected for all tracks.
- the DC bias of the track on the inner circumference side is reduced. Correction cannot be performed. Conventionally, such a drive device has been regarded as a defective product, and has reduced the yield.
- the value of the integration parameter I is near the boundary of the range of possible values of I described above, it may be out of the range due to disturbance or the like. It is desirable to provide a certain margin.
- the constant C described above is determined in a test at the time of manufacture so that the characteristics of the integration parameter I as shown in FIG. 6 are obtained for all the tracks so that the value of I is within a predetermined range for all the tracks. decide.
- the integral parameter I is measured when each track is track-followed for each disk drive device.
- a minimum value I1wr1im (800h in the above case) and a maximum value Iupr1im (7FFFFh in the above case) of the value of I are set in advance.
- the values of the above constant C and the variable Csub are set to 0 as an initial state.
- step S1 it is determined whether or not the value of I is out of the range of possible values of I at any track position.
- step S2 If this is the case, it is necessary to set the value of I and the constant C described above, so the process proceeds to step S2. If not, the process ends because the value of I is within the range of values that I can take at all track positions.
- step S2 it is determined whether or not the absolute value of the variable Csub is larger than the maximum value CsubmaX of the variable Csub. If the absolute value of the variable C sub is larger than the maximum value C subma X, the integration parameter I cannot be adjusted within the predetermined range. . If the absolute value of the variable C sub is smaller than the maximum value C submax (the upper limit of the number of retries), the process proceeds to step S4, where I can take the variable I max for detecting the maximum value of I The variable I min for detecting the minimum value of I is set to the maximum value I upr 1 im of the possible value of I, and the process proceeds to step S5.
- step S5 the variable X for counting tracks is cleared, and the process proceeds to step S6.
- step S6 seek to track X is performed, and the process proceeds to step S7.
- step S7 it is determined whether or not the seek has been completed normally. If the seek has been completed normally, the process proceeds to step S8, and the value of I (X) at this time is checked. In this check, if I (X) is greater than the previous maximum value Imax of I, I (X) is the maximum value Imax, and I (X) is the minimum value of I If it is smaller, I (X) is the minimum value I min. When the above checks are completed, the process proceeds to step S9.
- step S9 the value of the variable X is increased by 1, and the process proceeds to step S10.
- step S10 it is detected whether or not the processing from step S6 to step S9 has been completed for all the tracks. . If these processes have not been completed for all tracks, the process returns to step S6, and the processes from steps S6 to S9 are repeated. As a result, seeks are sequentially performed on all the tracks, and it is determined whether the seek has been completed normally. If these processes have been completed for all the tracks, the process proceeds to step S11, where the value of the constant C is obtained and the process ends. As a result, the value of I is adjusted to fall within the allowable range, and the value of the constant C according to the value of I is determined.
- step S7 if the seek has not been completed normally, the process proceeds to step S12, and it is determined whether or not the value of I (X) is greater than the maximum value I upr 1 im of I can take. I do. If applicable, proceed to step S13, Subtract 1 from the variable C sub and return to step S2. If not, the process proceeds to step S14, and it is determined whether or not the value of I (X) is smaller than the minimum value I1wr1im of the possible values of I. If so, proceed to step S15, add 1 to the variable C sub and return to step S2. If not, the process ends because it is considered that the seek did not end normally for a reason other than the value of I.
- the value of I differs for each track, but in order to hold all the values of I, it is necessary to use the above-described ROM 13 or the recording surface of the magnetic disk 1. It is necessary to secure a considerable recording area above.
- the same value of I is used within a step consisting of a predetermined number of tracks. For example, as shown in FIG.
- the step width is reduced, and the step width is increased for regions where the change in the value of I is small.
- the value of I discretized in this way is recorded on the recording surface of the ROM 13 or the magnetic disk 1 as a table showing the track number indicating the range of each step and the value of I in the step. Keep it.
- the HDC 20 determines the value of I according to the current track position with reference to this table, and calculates the servo data based on the above equation (1) or (2). Ask for data.
- the value of the integration parameter I is set to the same value within a predetermined step, and the step width is changed according to the change in the value of I, thereby reducing the accuracy of the value of I and reducing the recording capacity. Can be compatible.
- the seek characteristics can be improved by optimizing according to the operating environment, contributing to the improvement of the drive device performance. it can.
- the correction parameter sets the integration parameter held in the holding means according to the calculation accuracy of the calculation means, and corrects the calculation by the calculation means, so that the integration parameter exceeds the calculation accuracy by the calculation means.
- a device that has been conventionally regarded as defective can be used normally. Therefore, the yield can be improved without significantly increasing the cost.
- the integral parameter is set again by the resetting means, so that even if the characteristic of the integral parameter changes due to a change in the operating environment, The value of the integration parameter can be kept in an appropriate range. As a result, the recording / reproducing characteristics can be maintained.
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- Moving Of The Head To Find And Align With The Track (AREA)
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000584478A JP3712939B2 (ja) | 1998-11-26 | 1999-05-10 | ディスクドライブ装置及びその製造方法 |
PL99347829A PL347829A1 (en) | 1998-11-26 | 1999-05-10 | Disk drive, method of producing the same, and disk drive controller |
CA002349598A CA2349598A1 (en) | 1998-11-26 | 1999-05-10 | Disk drive, method of producing the same, and disk drive controller |
EP99921156A EP1146517A4 (en) | 1998-11-26 | 1999-05-10 | DISC DRIVE, METHOD FOR PRODUCING THE SAME, AND DISC DRIVE CONTROLLER |
HU0104545A HUP0104545A3 (en) | 1998-11-26 | 1999-05-10 | Disk drive, method of producing the same, and disk drive controller |
US09/856,767 US6700730B1 (en) | 1998-11-26 | 1999-05-10 | Method of using an integral parameter for correct placement of a read/write head |
HK02103363.1A HK1041972A1 (zh) | 1998-11-26 | 2002-05-03 | 磁盤驅動器及其製造方法和磁盤驅動器控制器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/335824 | 1998-11-26 | ||
JP33582498 | 1998-11-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000031738A1 true WO2000031738A1 (fr) | 2000-06-02 |
Family
ID=18292822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/002422 WO2000031738A1 (fr) | 1998-11-26 | 1999-05-10 | Lecteur de disque, son procede de production, et controleur de lecteur de disque |
Country Status (13)
Country | Link |
---|---|
US (1) | US6700730B1 (ja) |
EP (1) | EP1146517A4 (ja) |
JP (1) | JP3712939B2 (ja) |
KR (1) | KR100424133B1 (ja) |
CN (1) | CN100370548C (ja) |
CA (1) | CA2349598A1 (ja) |
HK (1) | HK1041972A1 (ja) |
HU (1) | HUP0104545A3 (ja) |
ID (1) | ID29258A (ja) |
MY (1) | MY124083A (ja) |
PL (1) | PL347829A1 (ja) |
RU (1) | RU2222057C2 (ja) |
WO (1) | WO2000031738A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6700730B1 (en) | 1998-11-26 | 2004-03-02 | Hitachi Global Storage Technologies Netherlands B.V. | Method of using an integral parameter for correct placement of a read/write head |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005158159A (ja) * | 2003-11-26 | 2005-06-16 | Toshiba Corp | 記録制御パラメータ最適化装置、記録制御パラメータ最適化方法、記録装置、及び記録方法 |
US8611032B2 (en) * | 2010-12-23 | 2013-12-17 | Western Digital Technologies, Inc. | Directional write retry for shingled disk drive application |
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JPH07326145A (ja) * | 1994-05-31 | 1995-12-12 | Nec Corp | ディスク装置 |
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JPH0340271A (ja) * | 1989-07-07 | 1991-02-21 | Hitachi Ltd | 磁気ディスク装置における制御パラメータ調整方法 |
JPH03212884A (ja) * | 1990-01-17 | 1991-09-18 | Nec Corp | 磁気ディスク装置 |
JPH04123447A (ja) | 1990-09-14 | 1992-04-23 | Toshiba Corp | 半導体実装装置及び実装方法 |
JPH04163554A (ja) | 1990-10-29 | 1992-06-09 | Konica Corp | 感光性平版印刷版の処理方法 |
JPH055457A (ja) | 1991-06-28 | 1993-01-14 | Mazda Motor Corp | エンジンのブロツク構造及びその組付方法 |
JP3169710B2 (ja) | 1992-08-17 | 2001-05-28 | 日本碍子株式会社 | 焼成用コンテナ |
JPH06131831A (ja) * | 1992-10-14 | 1994-05-13 | Toshiba Corp | 磁気ディスク装置 |
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PL347829A1 (en) | 1998-11-26 | 2002-04-22 | Ibm | Disk drive, method of producing the same, and disk drive controller |
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-
1999
- 1999-05-10 PL PL99347829A patent/PL347829A1/xx unknown
- 1999-05-10 JP JP2000584478A patent/JP3712939B2/ja not_active Expired - Fee Related
- 1999-05-10 WO PCT/JP1999/002422 patent/WO2000031738A1/ja not_active Application Discontinuation
- 1999-05-10 RU RU2001117222/28A patent/RU2222057C2/ru not_active IP Right Cessation
- 1999-05-10 HU HU0104545A patent/HUP0104545A3/hu unknown
- 1999-05-10 US US09/856,767 patent/US6700730B1/en not_active Expired - Fee Related
- 1999-05-10 CN CNB998138185A patent/CN100370548C/zh not_active Expired - Fee Related
- 1999-05-10 KR KR10-2001-7006413A patent/KR100424133B1/ko not_active IP Right Cessation
- 1999-05-10 EP EP99921156A patent/EP1146517A4/en not_active Withdrawn
- 1999-05-10 CA CA002349598A patent/CA2349598A1/en not_active Abandoned
- 1999-05-10 ID IDW00200101042A patent/ID29258A/id unknown
- 1999-11-10 MY MYPI99004882A patent/MY124083A/en unknown
-
2002
- 2002-05-03 HK HK02103363.1A patent/HK1041972A1/zh unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05314687A (ja) * | 1992-05-15 | 1993-11-26 | Sharp Corp | ディスク記録再生装置 |
JPH05334817A (ja) * | 1992-05-28 | 1993-12-17 | Nec Corp | ディスク装置の状態推定方式 |
JPH06215508A (ja) * | 1993-01-18 | 1994-08-05 | Nec Corp | 位置決め制御の状態推定器及び補償器とこれを用いた磁気ディスク装置 |
JPH07326145A (ja) * | 1994-05-31 | 1995-12-12 | Nec Corp | ディスク装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1146517A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6700730B1 (en) | 1998-11-26 | 2004-03-02 | Hitachi Global Storage Technologies Netherlands B.V. | Method of using an integral parameter for correct placement of a read/write head |
Also Published As
Publication number | Publication date |
---|---|
CN1328685A (zh) | 2001-12-26 |
EP1146517A1 (en) | 2001-10-17 |
ID29258A (id) | 2001-08-16 |
KR100424133B1 (ko) | 2004-03-25 |
HUP0104545A2 (hu) | 2002-03-28 |
HUP0104545A3 (en) | 2002-08-28 |
CA2349598A1 (en) | 2000-06-02 |
PL347829A1 (en) | 2002-04-22 |
RU2222057C2 (ru) | 2004-01-20 |
EP1146517A4 (en) | 2004-12-15 |
MY124083A (en) | 2006-06-30 |
KR20010080527A (ko) | 2001-08-22 |
CN100370548C (zh) | 2008-02-20 |
JP3712939B2 (ja) | 2005-11-02 |
HK1041972A1 (zh) | 2002-07-26 |
US6700730B1 (en) | 2004-03-02 |
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