Zone density sector counter

Details Zone density sector counter Zone density sector counter

1989-06-05

1991-03-12

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 40, G11B 509

Patent

active

049997203

ABSTRACT:
In the present invention, a single sector counter and accompanying multiple buffer registers are used to provide the sector count for a plurality of recording zones. Initially, the sector counter is validated by synchronizing it with an index mark. In one embodiment, an angular position sensing counter counts a clock having a frequency and phase to match the occurrence of segments in a reference zone. A look up table or computation provides an offset value representing the difference between each reference zone segment boundary, and the occurrence of the next consecutive sector in each of the recording zones. Additional logic generates periodic sector pulses once the zone transition has been accomplished, and provides means to prevent generation of shortened sector intervals. This permits rapid validation of the sector signal so that it is no longer necessary to wait for the index in a hard-sectored drive before establishing the sector position when changing zones. This improves the latency of the disk drive and overall system performance.

REFERENCES:
patent: 4674071 (1987-06-01), Okumura et al.
patent: 4858034 (1989-08-01), Hassel et al.

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