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1.发明专利
公开(公告)号：CA2127971C
公开(公告)日：1999-01-12
申请号：CA2127971
申请日：1994-07-13
Applicant: IBM
Inventor： ANDERSON TODD BARRY , HAGEN MARK DAVID
Abstract: A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data. At a predefined location of the disk surface a series of servo tracks of a predetermined high gain servo pattern are written. The predetermined high gain servo pattern includes 360.degree. phase difference information within each data cylinder. The servo tracks are detected for identifying servo phase information.
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公开(公告)号：DE69224701D1
公开(公告)日：1998-04-16
申请号：DE69224701
申请日：1992-10-28
Applicant: IBM
Inventor： ANDERSON CLARK ALAN , ANDERSON TODD BARRY , CADLONI GERALD LAWRENCE , CUNNINGHAM EARL ALBERT , HICKEN MICHAEL SCOTT , RENO DANIEL DONALD , STEPHENSON JOHN JEFFREY
Abstract: In a ultra high density, multiple-disk drive, track switches within a cylinder of tracks as well as track switches to tracks on other cylinders both require a movement of the head stack actuator. Track switching latency in such a disk drive is reduced by overlapping pre-movement portions of the track switching process with the data transfer operation of the currently active recording head. In addition, post-movement portions of the track switching process are overlapped with the movement of the heads so that the next selected read/write head may begin a data transfer operation immediately upon arrival at the next track. Further, the pre-movement and post-movement portions of the track-switch process may be overlapped with low displacement movement of the read/write heads relative to the currently active track or the next track.
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公开(公告)号：DE3382467D1
公开(公告)日：1992-01-16
申请号：DE3382467
申请日：1983-03-25
Applicant: IBM
Inventor： ANDERSON TODD BARRY , GLASER THOMAS WILLIAM , NEESZ JOHN JACOB
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公开(公告)号：DE69426345T2
公开(公告)日：2001-05-17
申请号：DE69426345
申请日：1994-09-06
Applicant: IBM
Inventor： ANDERSON TODD BARRY , HAGEN MARK DAVID
Abstract: A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data. At a predefined location of the disk surface a series of servo tracks of a predetermined high gain servo pattern are written. The predetermined high gain servo pattern includes 360 DEG phase difference information within each data cylinder. The servo tracks are detected for identifying servo phase information.
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公开(公告)号：DE69426345D1
公开(公告)日：2001-01-04
申请号：DE69426345
申请日：1994-09-06
Applicant: IBM
Inventor： ANDERSON TODD BARRY , HAGEN MARK DAVID
Abstract: A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data. At a predefined location of the disk surface a series of servo tracks of a predetermined high gain servo pattern are written. The predetermined high gain servo pattern includes 360 DEG phase difference information within each data cylinder. The servo tracks are detected for identifying servo phase information.
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Patent Agency Ranking
公开(公告)号：AT197852T
公开(公告)日：2000-12-15
申请号：AT94480084
申请日：1994-09-06
Applicant: IBM
Inventor： ANDERSON TODD BARRY , HAGEN MARK DAVID
Abstract: A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data. At a predefined location of the disk surface a series of servo tracks of a predetermined high gain servo pattern are written. The predetermined high gain servo pattern includes 360 DEG phase difference information within each data cylinder. The servo tracks are detected for identifying servo phase information.
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公开(公告)号：DE69224701T2
公开(公告)日：1998-10-29
申请号：DE69224701
申请日：1992-10-28
Applicant: IBM
Inventor： ANDERSON CLARK ALAN , ANDERSON TODD BARRY , CADLONI GERALD LAWRENCE , CUNNINGHAM EARL ALBERT , HICKEN MICHAEL SCOTT , RENO DANIEL DONALD , STEPHENSON JOHN JEFFREY
Abstract: In a ultra high density, multiple-disk drive, track switches within a cylinder of tracks as well as track switches to tracks on other cylinders both require a movement of the head stack actuator. Track switching latency in such a disk drive is reduced by overlapping pre-movement portions of the track switching process with the data transfer operation of the currently active recording head. In addition, post-movement portions of the track switching process are overlapped with the movement of the heads so that the next selected read/write head may begin a data transfer operation immediately upon arrival at the next track. Further, the pre-movement and post-movement portions of the track-switch process may be overlapped with low displacement movement of the read/write heads relative to the currently active track or the next track.
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公开(公告)号：SG47368A1
公开(公告)日：1998-04-17
申请号：SG1995002117
申请日：1992-10-28
Applicant: IBM
Inventor： ANDERSON CLARK ALAN , ANDERSON TODD BARRY , CADLONI GERALD LAWRENCE , CUNNINGHAM EARL ALBERT , HICKEN MICHAEL SCOTT , RENO DANIEL DONALD , STEPHENSON JOHN JEFFREY
Abstract: In a ultra high density, multiple-disk drive, track switches within a cylinder of tracks as well as track switches to tracks on other cylinders both require a movement of the head stack actuator. Track switching latency in such a disk drive is reduced by overlapping pre-movement portions of the track switching process with the data transfer operation of the currently active recording head. In addition, post-movement portions of the track switching process are overlapped with the movement of the heads so that the next selected read/write head may begin a data transfer operation immediately upon arrival at the next track. Further, the pre-movement and post-movement portions of the track-switch process may be overlapped with low displacement movement of the read/write heads relative to the currently active track or the next track.
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公开(公告)号：BR9403557A
公开(公告)日：1995-06-20
申请号：BR9403557
申请日：1994-09-14
Applicant: IBM
Inventor： ANDERSON TODD BARRY , HAGEN MARK DAVID
Abstract: A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data. At a predefined location of the disk surface a series of servo tracks of a predetermined high gain servo pattern are written. The predetermined high gain servo pattern includes 360 DEG phase difference information within each data cylinder. The servo tracks are detected for identifying servo phase information.
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公开(公告)号：DE3787209D1
公开(公告)日：1993-10-07
申请号：DE3787209
申请日：1987-04-28
Applicant: IBM
Inventor： STICH MICHAEL CHARLES , OTTESEN HJALMAR , RESMAN JOHN BORIS , ANDERSON TODD BARRY
Abstract: A controller for a voice coil motor driven disk file actuator (10) is described. The device has an online adjustable gain characteristic for controlling movement of the actuator assembly and an estimator (56) that estimates actuator velocity and bias. Forward gain is estimated from position and coil current measurements and compared with a nominal value to create an error signal used to adjust the controller and estimator gain characteristics. The control technique allows changes in the open loop system without changing the closed loop performance. By monitoring loop gain it is possible to alter compensator gains to maintain a constant closed loop performance.
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