Disc memory servo indexing system

Details Disc memory servo indexing system Disc memory servo indexing system

1989-02-06

1990-09-11

McElheny, Jr., Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

360 40, 360 722, 360 7814, G11B 2014

Patent

active

049567276

ABSTRACT:
A servo disc in a magnetic disc drive has pulses recorded in frames in concentric data tracks. Each frame includes first and second sync pulse groups of at least one sync pulse each, a first track alignment signal (Quad) following the first sync group, and a second track alignment signal (Sig) following the second sync group. A Guard Band and a data Track Zero are identified by eliminating one sync pulse in selected members of frames. Circuitry including monostable multivibrator, flip-flops, and gates identify the Guard Band and Track Zero.

REFERENCES:
patent: 4495533 (1985-01-01), Chambers
patent: 4539607 (1985-09-01), Fujiki
patent: 4682253 (1987-07-01), Leslie
patent: 4737869 (1988-04-01), Sugaya et al.

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