公开(公告)号：PL347829A1

公开(公告)日：2002-04-22

申请号：PL34782999

申请日：1999-05-10

Applicant: IBM

Inventor： OHZEKI HIDEKI ,  OKADA KENJI ,  TAKEUCHI KOHICHI

IPC: G11B21/10 ,  G11B21/08

Abstract: To provide a disk drive, a manufacturing method thereof, and a disk-drive controller which are capable of improving yield without increasing costs so significantly. When track-following control is performed, HDC 20 detects the current position of a read/write head 2, based on the reproduced output of a servo sector from a channel unit 5, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM 1 and the detected current position of the read/write head 2.

公开(公告)号：HU0104545A2

公开(公告)日：2002-03-28

申请号：HU0104545

申请日：1999-05-10

Applicant: IBM

Inventor： OHZEKI HIDEKI ,  OKADA KENJI ,  TAKEUCHI KOHICHI

IPC: G11B21/10 ,  G11B21/08

Abstract: To provide a disk drive, a manufacturing method thereof, and a disk-drive controller which are capable of improving yield without increasing costs so significantly. When track-following control is performed, HDC 20 detects the current position of a read/write head 2, based on the reproduced output of a servo sector from a channel unit 5, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM 1 and the detected current position of the read/write head 2.

公开(公告)号：ID29258A

公开(公告)日：2001-08-16

申请号：ID20011042

申请日：1999-05-10

Applicant: IBM

Inventor： OHZEKI HIDEKI ,  OKADA KENJI ,  TAKEUCHI KOHICHI

IPC: G11B21/10 ,  G11B21/08

Abstract: To provide a disk drive, a manufacturing method thereof, and a disk-drive controller which are capable of improving yield without increasing costs so significantly. When track-following control is performed, HDC 20 detects the current position of a read/write head 2, based on the reproduced output of a servo sector from a channel unit 5, and makes a calculation of servo data by employing both an integral parameter corresponding to a target track to be read onto a RAM 1 and the detected current position of the read/write head 2.

公开(公告)号：CA2349598A1

公开(公告)日：2000-06-02

申请号：CA2349598

申请日：1999-05-10

Applicant: IBM

Inventor： OKADA KENJI ,  TAKEUCHI KOICHI ,  OHZEKI HIDEKI

IPC: G11B21/10 ,  G11B21/08

Abstract: A disk drive, method of producing the same, and disk drive controller are provided with little increase of cost at an improved yield. An HDC (20) find s the current position of a head (2) to perform track following control based on the reproduction output of a servosector from a channel (5) and performs computation about servo data by using an integration parameter corresponding to the target track which is read and stored in a RAM (1) and the current position of the head (2).

公开(公告)号：SG55374A1

公开(公告)日：1998-12-21

申请号：SG1997003416

申请日：1997-09-15

Applicant: IBM

Inventor： SAITOH TAKAHIRO ,  KIBASHI AKIRA ,  OKADA KENJI ,  OHZEKI HIDEKI

IPC: G06F3/06 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: A disk device and a method are described for reassigning data areas (e.g. sectors) which minimize the reduction in the data transfer rate when alternate data areas are used to replace defective areas. The disk device uses a plurality of data zones with spare areas allocated in each data zone. An alternate area is allocated (a) in the spare area within the data zone where the error occurs and (b) at an angular position offset more than a predetermined angle from a position of the data in which the error occurs. The offset angle allows the device time to seek to the alternate area, read the alternate area and seek back to the area following the defective area within a single rotation of the disk.

公开(公告)号：JPH11191201A

公开(公告)日：1999-07-13

申请号：JP35689697

申请日：1997-12-25

Applicant: IBM

Inventor： SUZUKI HIROMASA ,  KURACHI KOJI ,  SUDA KATSUMI ,  ASANO HIDEO ,  OKADA KENJI ,  TAKASE MAKOTO ,  KIHASHI AKIRA ,  NISHINOMIYA HIROMI ,  MATSUI TAKAO ,  ENDO TATSUYA ,  KUROKI KENJI

IPC: G11B5/02 ,  G11B5/09 ,  G11B5/39 ,  G11B5/455 ,  G11B19/04 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To improve the performance of an information recording/reproducing device using a GMR(giant magnet resistance) sensor. SOLUTION: This method aims at the restoration of an operating error generated in an information recording/reproducing device including a storage medium, a head using a GMR sensor, an actuator arm for mounting the head and locating the head on a prescribed position on the front surface of the storage medium and a control part for controlling the operation of the actuator arm and read/write operation. At this time, it comprises a step for executing a first error restoring procedure 103, a step for executing a first GMR evaluating procedure 109 for evaluating the performance of the GMR sensor when the operating error is not restored in the first error restoring procedure and a step 117 for impressing a reset pulse to the GMR sensor in accordance with the first GMR evaluating procedure.

公开(公告)号：JP2000149463A

公开(公告)日：2000-05-30

申请号：JP31785998

申请日：1998-11-09

Applicant: IBM

Inventor： OKADA KENJI ,  ASANO HIDEO ,  OKUTSU KAZUE

IPC: G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/596 ,  G11B19/02 ,  G11B19/04 ,  G11B20/18 ,  G11B27/36 ,  G11B33/14

Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, an error recovery processing method of the disk drive device and a disk drive controller, which are capable of contributing to prevention of decrease of the recording capacity and improvement of the reliability. SOLUTION: When the recording/reproducing operation by a recording/ reproducing part 4 is not normally completed, an error recovery process is executed by a control part 3. In the case where the error is not recovered even by this process, the recording/reproducing operation is re-executed against the region where the error is generated, after the standby of a specified time. When the error is still not recovered, the region where the error is generated, is tentatively registered as the error region.

公开(公告)号：JP2002258902A

公开(公告)日：2002-09-13

申请号：JP2001053226

申请日：2001-02-27

Applicant: IBM

Inventor： UCHIDA HIROSHI ,  SENBA TETSUO ,  YUZUBA AKINORI ,  TOKIZONO AKIRA ,  KAGAMI NAOYUKI ,  OKADA KENJI

IPC: G11B21/08 ,  G05B11/32 ,  G05B13/04 ,  G11B5/596

Abstract: PROBLEM TO BE SOLVED: To reduce a modeling error including a control model assumed under model follow-up control to a level in which any practical problem is not generated concerning a gain and a phase. SOLUTION: In a control means having a feed-forward system and a feedback system, a control model for generating reference position data yr from a feed- forward control signal Uff0 is divided into an original control model 22 and a correction filter 23. Also, the gain correction of the feed-forward control signal Uff0 is operated by a gain correcting means 24, and a corrected feed- forward control signal Uff is generated. The reference position data yr are inputted to a feedback controller 25, and a feedback control signal Ufb being the output of the feedback controller 25 and the feed-forward control signal Uff are inputted to an object 26 to be controlled. The coefficients of a correction filter 23 and a gain correcting means 24 are corrected according to a head orbit based on the actual seek operation.

公开(公告)号：JPH11191274A

公开(公告)日：1999-07-13

申请号：JP35780797

申请日：1997-12-25

Applicant: IBM

Inventor： ASANO HIDEO ,  OKADA KENJI ,  UEDA TETSUO ,  ARAI KOICHI ,  OZEKI HIDENORI

IPC: G11B21/10 ,  G11B5/55

Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a seek controller easy to make a narrow track pitch. SOLUTION: The data are recorded by adding an offset to a position of a reproducing head 22 according to the reproducing head 22 according to a yaw θ of a head and the offset ΔW in the track width direction of a recording head. At a reproducing time, the position of the reproducing head 22 is made the position of the recording head 23 at a recording time, the middle position between the position of the recording head 23 at a recording time and the position of the reproducing head 22 at the recording time or a center of a track, and the reproducing is performed.

公开(公告)号：JPH09167303A

公开(公告)日：1997-06-24

申请号：JP33030095

申请日：1995-12-19

Applicant: IBM

Inventor： OKADA KENJI ,  ARAI KOICHI ,  TSUNODA HISASHI ,  SUZUKI HIROMASA ,  SASAKI MASAKAZU ,  KIHASHI AKIRA ,  ENDO TATSUYA

IPC: G11B21/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B20/18 ,  G11B20/24 ,  G11B27/36 ,  G11B33/10

Abstract: PROBLEM TO BE SOLVED: To eliminate generation of thermal asperity and to avoid generation of error by making head vibration have a directional component approaching the disk surface. SOLUTION: When an error is generated, a vibration signal from a means 52 is superposed on a signal from a controller 43 by a direction of HDC and supplied to a VCM driving means 45. And a head 20 is positioned at a desired position according to thermal asperity position. By providing the VCM 46 with a vibration signal, a head assembly starts rolling movement centering the joint point with a dimple. And the head assembly generates vertical vibration with a frequency equivalent to the given vibration signal frequency, and eliminate the thermal asperity on the disk.