Disk file with multiplexed servo system

Details Disk file with multiplexed servo system Disk file with multiplexed servo system

1994-03-10

1995-12-19

Epps, Georgia Y.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7706, 360 7705, 360 75, 369 43, G11B 5596

Patent

active

054774020

ABSTRACT:
A disk file includes multiple disk surfaces, on which servo information is recorded, with an offset in azimuth from one disk surface to another. Each head comprises a magnetoresistive stripe for reading and an inductive write coil. The servo system reads servo information from each disk in turn, multiplexing the signals from each disk together to form a single position error signal (PES). The separation of the servo multiplexer, attached to the MR stripes, from the write multiplexer, attached to the inductive coils, avoids problems due to contamination of the servo signal by the write signal. A least squares fit is used to generate the PES from the series of servo samples from each disk surface.

REFERENCES:
patent: 4075667 (1978-02-01), Rose et al.
patent: 4896228 (1990-01-01), Amakasu et al.
patent: 5099367 (1992-03-01), Sidman
patent: 5117408 (1992-05-01), Weispfenning et al.
IBM Technical Disclosiure Bulletin vol. 28 No. 8 Jan. 1986 p. 300 "Disc File Controlled by Multiplexed Servo Samples".

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