公开(公告)号：DE69425096D1

公开(公告)日：2000-08-10

申请号：DE69425096

申请日：1994-07-28

Applicant: IBM

Inventor： CUNNINGHAM EARL ALBERT ,  OTTESEN HAL HJALMAR ,  ERICKSON KEVIN JACK

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

Abstract: Rotary actuator arc compensation correction method and apparatus are provided for a direct access storage device (DASD). A reference feedforward correction signal (64) is generated at each of a plurality of sectors around a predetermined track on a disk surface. A specific selected track is identified, and both magnitude and phase of the generated reference feedforward correction signal are modified to correct for the arced trajectory caused by the rotary actuator (58) at the specific selected track. Improved actuator servo control is provided by using pseudo sector compensation to interpolate the feedforward correction signal between servo sectors.

公开(公告)号：DE69315270T2

公开(公告)日：1998-05-28

申请号：DE69315270

申请日：1993-07-15

Applicant: IBM

Inventor： BROWN DANA HENRY ,  ERICKSON KEVIN JACK ,  GOOD DANIEL L ,  GREENBERG RICHARD ,  HERMAN PETER MAURICE ,  OTTESEN HAL HJALMAR

IPC: G06F3/06 ,  G06F12/16 ,  G11B19/04 ,  G11B19/12 ,  G11B20/10 ,  G11B20/18 ,  G11B5/55

Abstract: A secondary data storage system for a host computer system includes a disk drive system having a device controller, at least a first magnetic disk and a read/write magnetic transducer positionable with respect to a recording surface of each magnetic disk. A write operation exposes data on adjacent tracks to potential damage if an off track condition occurs to the transducer during a write. A method for controlling write operations through the device controller provides backup of data in tracks adjacent to a target track for the write operation prior to the write operation occurring. The method detects occurrence of events resulting in an off track condition of the magnetic transducer relative to a target track. Occurrence of such an event triggers a determination of damage to the contents of tracks adjacent to the target track and restoration of those tracks. Write operations to the target track are blocked until shock events discontinue.

公开(公告)号：DE69315270D1

公开(公告)日：1998-01-02

申请号：DE69315270

申请日：1993-07-15

Applicant: IBM

Inventor： BROWN DANA HENRY ,  ERICKSON KEVIN JACK ,  GOOD DANIEL L ,  GREENBERG RICHARD ,  HERMAN PETER MAURICE ,  OTTESEN HAL HJALMAR

IPC: G06F3/06 ,  G06F12/16 ,  G11B19/04 ,  G11B19/12 ,  G11B20/10 ,  G11B20/18 ,  G11B5/55

Abstract: A secondary data storage system for a host computer system includes a disk drive system having a device controller, at least a first magnetic disk and a read/write magnetic transducer positionable with respect to a recording surface of each magnetic disk. A write operation exposes data on adjacent tracks to potential damage if an off track condition occurs to the transducer during a write. A method for controlling write operations through the device controller provides backup of data in tracks adjacent to a target track for the write operation prior to the write operation occurring. The method detects occurrence of events resulting in an off track condition of the magnetic transducer relative to a target track. Occurrence of such an event triggers a determination of damage to the contents of tracks adjacent to the target track and restoration of those tracks. Write operations to the target track are blocked until shock events discontinue.

公开(公告)号：DE69125447T2

公开(公告)日：1997-09-25

申请号：DE69125447

申请日：1991-09-06

Applicant: IBM

Inventor： BROWN DANA HENRY ,  CUNNINGHAM EARL ALBERT ,  ERICKSON KEVIN JACK ,  ESTRY RICHARD HUNT ,  GLASER THOMAS WILLIAM ,  HAGEN MARK DAVID ,  OTTESEN HAL HJALMAR ,  PALMER DEAN CURTIS ,  STEPHENSON JOHN JEFFREY

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B7/08 ,  G11B21/02 ,  G11B21/08 ,  G11B5/265

Abstract: Disclosed is an apparatus and method for correcting for track misregistration when a slider or head assembly contains a separate read element (40) and write element (42). Basically, the offset is determined at a first position and at a second position of the actuator arm (48) assembly. From these offsets a constant and a multiplier are determined for determining an offset as a function of the cylinder location. Also disclosed is a method and apparatus for minimizing distance traveled to prevent misregistration when repositioning between the read element and a write element. The read element is intentionally offset from the write element at an angle so as to minimize the distance traveled across the disk.

公开(公告)号：DE69425096T2

公开(公告)日：2001-03-22

申请号：DE69425096

申请日：1994-07-28

Applicant: IBM

Inventor： CUNNINGHAM EARL ALBERT ,  OTTESEN HAL HJALMAR ,  ERICKSON KEVIN JACK

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10

Abstract: Rotary actuator arc compensation correction method and apparatus are provided for a direct access storage device (DASD). A reference feedforward correction signal (64) is generated at each of a plurality of sectors around a predetermined track on a disk surface. A specific selected track is identified, and both magnitude and phase of the generated reference feedforward correction signal are modified to correct for the arced trajectory caused by the rotary actuator (58) at the specific selected track. Improved actuator servo control is provided by using pseudo sector compensation to interpolate the feedforward correction signal between servo sectors.

公开(公告)号：SG52245A1

公开(公告)日：1998-09-28

申请号：SG1996001217

申请日：1993-06-03

Applicant: IBM

Inventor： ERICKSON KEVIN JACK ,  GREENBERG RICHARD

IPC: G11B21/08 ,  G11B21/10 ,  G11B5/55

公开(公告)号：SG46192A1

公开(公告)日：1998-02-20

申请号：SG1996000419

申请日：1991-09-06

Applicant: IBM

Inventor： BROWN DANA HENRY ,  CUNNINGHAM EARL ALBERT ,  ERICKSON KEVIN JACK ,  ESTRY RICHARD HUNT ,  GLASER THOMAS WILLIAM ,  HAGEN MARK DAVID ,  OTTESEN HAL HJALMAR ,  PALMER DEAN CURTIS ,  STEPHENSON JOHN JEFFREY

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B7/08 ,  G11B21/02 ,  G11B21/08 ,  G11B5/265

Abstract: Disclosed is an apparatus and method for correcting for track misregistration when a slider or head assembly contains a separate read element (40) and write element (42). Basically, the offset is determined at a first position and at a second position of the actuator arm (48) assembly. From these offsets a constant and a multiplier are determined for determining an offset as a function of the cylinder location. Also disclosed is a method and apparatus for minimizing distance traveled to prevent misregistration when repositioning between the read element and a write element. The read element is intentionally offset from the write element at an angle so as to minimize the distance traveled across the disk.

公开(公告)号：DE69125447D1

公开(公告)日：1997-05-07

申请号：DE69125447

申请日：1991-09-06

Applicant: IBM

Inventor： BROWN DANA HENRY ,  CUNNINGHAM EARL ALBERT ,  ERICKSON KEVIN JACK ,  ESTRY RICHARD HUNT ,  GLASER THOMAS WILLIAM ,  HAGEN MARK DAVID ,  OTTESEN HAL HJALMAR ,  PALMER DEAN CURTIS ,  STEPHENSON JOHN JEFFREY

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B7/08 ,  G11B21/02 ,  G11B21/08 ,  G11B5/265

Abstract: Disclosed is an apparatus and method for correcting for track misregistration when a slider or head assembly contains a separate read element (40) and write element (42). Basically, the offset is determined at a first position and at a second position of the actuator arm (48) assembly. From these offsets a constant and a multiplier are determined for determining an offset as a function of the cylinder location. Also disclosed is a method and apparatus for minimizing distance traveled to prevent misregistration when repositioning between the read element and a write element. The read element is intentionally offset from the write element at an angle so as to minimize the distance traveled across the disk.