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公开(公告)号：SG72898A1
公开(公告)日：2000-05-23
申请号：SG1998005167
申请日：1998-12-03
Applicant: IBM
Inventor： STEPHENSON JOHN JEFFREY
Abstract: A method and apparatus are provided for variable spindle rotation speed in a direct access storage device (DASD). The direct access storage device (DASD) includes a multi-phase, brushless, direct current (DC) spindle motor. Speed and commutation control signals are applied to a plurality of spindle motor drivers for normally operating the plurality of spindle motor drivers in saturation mode while performing read and write operations. A spindle rotational speed is detected and compared with a predetermined spindle speed range. Responsive to the detected spindle rotational speed being within said predetermined spindle speed range, normal operations of the direct access storage device (DASD) are enabled. One or more write sync fields are provided on each surface of a magnetic disk media. The write sync field is used for timing write operations in the direct access storage device.
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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：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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14.发明专利
公开(公告)号：HU0003983A2
公开(公告)日：2001-03-28
申请号：HU0003983
申请日：1998-12-10
Applicant: IBM
Inventor： STEPHENSON JOHN JEFFREY
Abstract: A method and apparatus are provided for variable spindle rotation speed in a direct access storage device (DASD). The direct access storage device (DASD) includes a multi-phase, brushless, direct current (DC) spindle motor. Speed and commutation control signals are applied to a plurality of spindle motor drivers for normally operating the plurality of spindle motor drivers in saturation mode while performing read and write operations. A spindle rotational speed is detected and compared with a predetermined spindle speed range. Responsive to the detected spindle rotational speed being within said predetermined spindle speed range, normal operations of the direct access storage device (DASD) are enabled. One or more write sync fields are provided on each surface of a magnetic disk media. The write sync field is used for timing write operations in the direct access storage device.
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公开(公告)号：PL341051A1
公开(公告)日：2001-03-26
申请号：PL34105198
申请日：1998-12-10
Applicant: IBM
Inventor： STEPHENSON JOHN JEFFREY
Abstract: A method and apparatus are provided for variable spindle rotation speed in a direct access storage device (DASD). The direct access storage device (DASD) includes a multi-phase, brushless, direct current (DC) spindle motor. Speed and commutation control signals are applied to a plurality of spindle motor drivers for normally operating the plurality of spindle motor drivers in saturation mode while performing read and write operations. A spindle rotational speed is detected and compared with a predetermined spindle speed range. Responsive to the detected spindle rotational speed being within said predetermined spindle speed range, normal operations of the direct access storage device (DASD) are enabled. One or more write sync fields are provided on each surface of a magnetic disk media. The write sync field is used for timing write operations in the direct access storage device.
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Patent Agency Ranking
公开(公告)号：DE69125972T2
公开(公告)日：1997-10-23
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：CA2050152C
公开(公告)日：1996-07-09
申请号：CA2050152
申请日：1991-08-28
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 is written on a first data disk surface aligned with a predefined servo information track on the dedicated servo disk surface. Then servo reference tracks are sequentially written on each successive consecutive data disk 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：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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公开(公告)号：SG42836A1
公开(公告)日：1997-10-17
申请号：SG1996000009
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：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
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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