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1.发明专利
公开(公告)号：JP2002197816A
公开(公告)日：2002-07-12
申请号：JP2001325964
申请日：2001-10-24
Applicant: IBM
Inventor： GREEN MARTIN REN , STEPHENSON JOHN JEFFREY , STICH MICHAEL CHARLES
Abstract: PROBLEM TO BE SOLVED: To accelerate and then decelerate an actuator arm so as to reduce the seek time of the arm in order to increase the data processing speed of a computer system. SOLUTION: Supplying a maximum current to a voice coil accelerates the actuator arm, and when the actuator arm travels by a prescribed distance, the direction of current is changed and a deceleration current is supplied in a saturation mode to the actuator arm to decelerate the actuator arm, Applying the deceleration current in the saturation mode can properly decelerate the actuator arm and allows the arm to come to a stop when the actuator arm reaches an object track position.
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2.发明专利
公开(公告)号：JPH11252984A
公开(公告)日：1999-09-17
申请号：JP33885898
申请日：1998-11-30
Applicant: IBM
Inventor： STEPHENSON JOHN JEFFREY
Abstract: PROBLEM TO BE SOLVED: To substantially eliminate advance influence by realizing regular operation of DASD, in response to the results where control signals being supplied to a plurality of spindle motor drivers, spindle rotation speed detected and it is within a prescribed spindle speed range. SOLUTION: A spindle motor drive control operation is started, and a spindle driver element is operated at a saturation mode. Measured spindle speed is compared with the spindle speed of a disk file 100 in a prescribed range. When measured spindle speed is within the prescribed range, a regular file operation is continued. A read timing operation and a write timing operation in the data storage disk file 100 are started at the arrival of a transducer 128 onto a track. A data channel timing voltage frequency oscillator is synchronized with a read- back frequency from a write synchronous field.
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公开(公告)号：FR2799085B1
公开(公告)日：2005-02-04
申请号：FR0011030
申请日：2000-08-29
Applicant: IBM
Inventor： BUSH GREGORY SCOTT , STEPHENSON JOHN JEFFREY
Abstract: An equalization method and apparatus with gain adjustment are provided for a direct access storage device (DASD) data channel. A direction for moving each of a plurality of tap weights is calculated. New tap weights are determined for each of a plurality of tap weights in the direction. A gain of the FIR filter for the new tap weights is compared with a set threshold gain value. A gain of a gain loop of the data channel is incrementally adjusted responsive to the compared gain and set threshold gain values. A phase lag of the FIR filter for the new tap weights is compared with a set threshold phase lag value. A phase of a timing loop of the data channel is incrementally adjusted responsive to the compared phase lag and set threshold phase lag values.
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4.发明专利
公开(公告)号：FR2799085A1
公开(公告)日：2001-03-30
申请号：FR0011030
申请日：2000-08-29
Applicant: IBM
Inventor： BUSH GREGORY SCOTT , STEPHENSON JOHN JEFFREY
Abstract: The equalization method determines the sense to adjust the value of each of the finite impulse response filter (FIR) coefficients, and calculates new values for each coefficient and adjusts them. The gain of the FIR under the new coefficients is compared with a predetermined gain threshold, and the gain of the gain loop of the data channel is adjusted in response to the comparison.
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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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Patent Agency Ranking
公开(公告)号：DE69125972D1
公开(公告)日：1997-06-12
申请号：DE69125972
申请日：1991-06-14
Applicant: IBM
Inventor： GREEN MARTIN REN , STEPHENSON JOHN JEFFREY , STICH MICHAEL CHARLES
Abstract: Disclosed is a method for performing a seek operation in a disk drive using current in the saturation mode to accelerate and decelerate the actuator arm. In a first embodiment, several measurements are made during the acceleration portion of the seek to estimate the deceleratlon available in saturation mode. In a second embodiment, the point at which the current is switched from acceleration current to deceleration current is adjusted based upon the position where the actuator arm comes within a desired amount of the velocity of a velocity profile assuming worst case conditions.
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公开(公告)号：CZ20002132A3
公开(公告)日：2000-12-13
申请号：CZ20002132
申请日：1998-12-10
Applicant: IBM
Inventor： STEPHENSON JOHN JEFFREY
IPC: G11B19/28
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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：SG46503A1
公开(公告)日：1998-02-20
申请号：SG1996005306
申请日：1991-08-29
Applicant: IBM
Inventor： GREEN MARTIN REN , HEINEKE RANDOLPH BRUCE , STEPHENSON JOHN JEFFREY
Abstract: A transducer head skew arrangement used in a multiple disk drive data storage system is provided. The disk drive unit includes a plurality of magnetic disk surfaces mounted for simultaneous rotation about an axis. A first sequence of servo information tracks are arrayed on a dedicated servo disk surface. At least one servo reference track is written on each data disk surface for storing servo reference information. The servo reference track (R0) is written on a first data disk (18) surface aligned with a predefined servo information track (22) on the dedicated servo disk (20) surface. Then servo reference tracks (R1-R13) are sequentially written on each successive consecutive data disk (18) surface progressively offset radially from the last written servo reference track. A plurality of data information tracks for storing data are disposed at predetermined positions relative to the servo reference track on each the data disk surface. A servo transducer head is mounted for movement in a radial direction across the first dedicated servo information for reading servo information; and a plurality of data transducer heads are mounted for movement with the servo transducer head in a radial direction across the disk surfaces for reading the servo reference tracks and for reading and/or writing data to the data information tracks. The distance moved by transducer heads for a cylinder switch is the same distance moved for each head switch, so that track-to-track seek time is minimized without requiring any additional time delay for each head switch. An overall data transfer rate increases for every data transfer accessing more than one data cylinder.
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公开(公告)号：DE69118803D1
公开(公告)日：1996-05-23
申请号：DE69118803
申请日：1991-08-29
Applicant: IBM
Inventor： GREEN MARTIN REN , HEINEKE RANDOLPH BRUCE , STEPHENSON JOHN JEFFREY
Abstract: A transducer head skew arrangement used in a multiple disk drive data storage system is provided. The disk drive unit includes a plurality of magnetic disk surfaces mounted for simultaneous rotation about an axis. A first sequence of servo information tracks are arrayed on a dedicated servo disk surface. At least one servo reference track is written on each data disk surface for storing servo reference information. The servo reference track (R0) is written on a first data disk (18) surface aligned with a predefined servo information track (22) on the dedicated servo disk (20) surface. Then servo reference tracks (R1-R13) are sequentially written on each successive consecutive data disk (18) surface progressively offset radially from the last written servo reference track. A plurality of data information tracks for storing data are disposed at predetermined positions relative to the servo reference track on each the data disk surface. A servo transducer head is mounted for movement in a radial direction across the first dedicated servo information for reading servo information; and a plurality of data transducer heads are mounted for movement with the servo transducer head in a radial direction across the disk surfaces for reading the servo reference tracks and for reading and/or writing data to the data information tracks. The distance moved by transducer heads for a cylinder switch is the same distance moved for each head switch, so that track-to-track seek time is minimized without requiring any additional time delay for each head switch. An overall data transfer rate increases for every data transfer accessing more than one data cylinder.
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