公开(公告)号：HK71696A

公开(公告)日：1996-05-03

申请号：HK71696

申请日：1996-04-25

Applicant: IBM

Inventor： BEST JOHN STEWART ,  WANG PO-KANG

IPC: G11B5/596 ,  G11B21/10

Abstract: A method of positioning separate read and write heads in a disk file compensates for misalignment of the heads when reading and writing data on the disk. Two sets of servo information are generated for each track on the disk. These sets are radially displaced with respect to each other by a distance equal to the respective misalignments between the read and write heads at each respective track. One set is generated by the write head. The other set is generated by the write head while the read head is aligned with said one set. Thereafter, to write data on a selected track, the read head is first aligned with said one set of servo information and then data is written on said track with the write head. To read data on a selected track, the read head is aligned to said other set of servo information and then the data is read by said read head.

公开(公告)号：BR9101260A

公开(公告)日：1991-11-05

申请号：BR9101260

申请日：1991-03-28

Applicant: IBM

Inventor： BEST JOHN STEWART ,  CHAINER TIMOTHY JOSEPH ,  GLASER THOMAS WILLIAM ,  GREENBERG RICHARD ,  MUKHERJEE AVIJIT ,  NEUBAUER JERRY LEE ,  REIDENBACH JOHN RALPH ,  SCHOPP ROBERT ELLSWORTH ,  SCRANTON ROBERT ALAN

IPC: G11B20/12 ,  G06F3/06 ,  G06F11/00 ,  G06F11/10 ,  G06F11/20 ,  G11B20/18 ,  G11B33/02 ,  G11C29/00 ,  G11B5/02

Abstract: A disk drive storage system comprises an array of disk drive units (230). The disk drives (160) contained in the units have a diameter of 65mm and rotate at 10,000 RPM which has the effect of reducing latency. In a preferred embodiment data and corresponding parity information are converted into portions and stored on a respective different one of the disk drive units. Data stored on a filed disk drive unit can be regenerated on a replacement disk drive unit. A disk drive unit can be replaced without powering down the system. Four disk drive units can be arranged in a four drive system to match the space geometry of the traditional half-high flexible disk drive used in a personal computer.

公开(公告)号：DE3380328D1

公开(公告)日：1989-09-07

申请号：DE3380328

申请日：1983-11-15

Applicant: IBM

Inventor： BEST JOHN STEWART ,  LEE KENNETH ,  TSANG CHING HWA

IPC: G11B5/31 ,  G11B5/39 ,  G11B5/127 ,  G11B5/33

Abstract: A dual element magnetic transducer in which the thin film M/R read element is transversely biased by flux in the air gap of the inductive write core generated by a bias current supplied to the write winding. Flux in the air gap biases the M/R element because different integral portions of the M/R element have a different spatial relationship to parallel opposing portions of the inductive core. The flux which would normally pass through the gap substantially normal to the sides of the core defining the gap now tends to follow the M/R element along a direction normal or transverse to the media to a point where the distance between the M/R element and the core is smaller than where it entered. By appropriate control of the bias current and the spatial relationships, a relatively efficient, simple to manufacture dual element magnetic transducer is provided.

公开(公告)号：DE3469623D1

公开(公告)日：1988-04-07

申请号：DE3469623

申请日：1984-07-16

Applicant: IBM

Inventor： BULLOCK DAVID CARL ,  BEST JOHN STEWART

IPC: C08L83/04 ,  G11B5/596 ,  G11B5/73 ,  G11B5/733 ,  G11B5/82 ,  G11B9/06 ,  G11B23/30

Abstract: A magnetic recording disk substrate is provided with a capacitive servo pattern by implanting dopant material in the substrate to modify the substrate conductivity in a desired servo pattern.