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公开(公告)号：DE69423400T2
公开(公告)日：2000-09-07
申请号：DE69423400
申请日：1994-06-21
Applicant: IBM
Inventor： CUNNINGHAM EARL ALBERT , HANSON BRADLEY E
Abstract: The method is applicable to a disk drive data storage system of the type including at least one disk surface and at least one transducer head for reading and/or writing data to a respective disk surface. A set of data recovery procedures is stored. When a read back error is detected in a read back data signal, a set of predetermined transducer head and disk parameters is identified. One of the stored data recovery procedures is selected responsive to the detected read back error and the identified predetermined transducer head and disk parameters.
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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：SG43696A1
公开(公告)日：1997-11-14
申请号：SG1995002232
申请日：1994-06-21
Applicant: IBM
Inventor： CUNNINGHAM EARL ALBERT , HANSON BRADLEY E
Abstract: The method is applicable to a disk drive data storage system of the type including at least one disk surface and at least one transducer head for reading and/or writing data to a respective disk surface. A set of data recovery procedures is stored. When a read back error is detected in a read back data signal, a set of predetermined transducer head and disk parameters is identified. One of the stored data recovery procedures is selected responsive to the detected read back error and the identified predetermined transducer head and disk parameters.
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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
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.
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公开(公告)号：DE69022436D1
公开(公告)日：1995-10-26
申请号：DE69022436
申请日：1990-01-22
Applicant: IBM
Inventor： CUNNINGHAM EARL ALBERT
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Patent Agency Ranking
公开(公告)号：DE3065558D1
公开(公告)日：1983-12-15
申请号：DE3065558
申请日：1980-12-04
Applicant: IBM
Inventor： CUNNINGHAM EARL ALBERT
Abstract: A servo system is disclosed for centering a transducer over a path defined by the boundary between adjacent servo tracks on a magnetic disk in which the servo tracks are each formed by alternate long and short magnetic segments, with the short segments in one track being centred with the long segments of adjacent tracks. The servo system includes a frequency doubler circuit (18) for producing a uniform frequency square wave signal of double the fundamental frequency of the analog signal picked up by the transducer from the servo encoding, a filter (77) connected with the transducer for producing an analog double frequency signal based on the analog signal from the transducer, a synchronous detector (80) functioning as a multiplier for multiplying the double frequency square wave signal with the analog double frequency signal from the transducer, and a filter (82) for averaging the resultant pulsating position error signal to provide a steady state position error signal for any particular position of the transducer over a pair of adjacent servo tracks. The steady state position error signal is applied to a servo control and servo actuator for moving the transducer until the steady state position error signal reaches zero which corresponds with the desired centred position of the transducer over the boundary between a pair of adjacent servo tracks.
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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
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.
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公开(公告)号：HU216593B
公开(公告)日：1999-07-28
申请号：HU9401225
申请日：1992-09-16
Applicant: IBM
Inventor： CUNNINGHAM EARL ALBERT , HARWOOD RICHARD FRED
Abstract: The leading (47) and trailing (48) edges are relative to the motion of the medium. The longitudinal axis is disposed along the length of the support structure and is at a skew angle ranging from zero to positive and negative valves, wrt the direction of motion. A pair of side rails is disposed along the side edges facing the recording medium. The side rails are non-identical and non-symmetrical about the axis for providing air pressurisation about the axis for providing air pressurisation when the skew angle varies over its range. The slider thus flies at a close, uniform spacing from the moving recording medium.
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公开(公告)号：SG49345A1
公开(公告)日：1998-05-18
申请号：SG1996010506
申请日：1996-08-23
Applicant: IBM
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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
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.
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