Method and apparatus for sensing position in a disk drive

Details Method and apparatus for sensing position in a disk drive Method and apparatus for sensing position in a disk drive

1994-12-14

1997-02-11

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, G11B 5596

Patent

active

056026935

ABSTRACT:
A system for positioning a plurality of heads traversing multiple disks in a disk drive system is disclosed herein. The positioning system includes a servo pattern recorded on at least one of the hard disks, the servo pattern having a sequence of servo locations successively recorded along concentric tracks on the disks. Burst zones are also recorded on the hard disks, each burst zone having multiple transitions recorded at staggered separate radial distances from the center of the disks. The positioning system contains means for computing servo burst signal magnitudes based on head position relative to the transitions in each burst zone, and means for calculating a head offset based on differences between the servo burst signal magnitudes and radial displacement of each head in each track. The positioning system transmits a correction signal based on calculated head position, and the output signal has a linear response for any head position on the disk.

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patent: 4910617 (1990-03-01), Brunnett et al.
patent: 4949201 (1990-08-01), Abed
patent: 5153787 (1992-10-01), Sidman

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