Disk apparatus

Details Disk apparatus Disk apparatus

1991-06-27

1992-12-29

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

051756544

ABSTRACT:
A disk apparatus of zone-recording type having a plurality of recording zones is structured such that a plurality of reference clock signals, each corresponding to a recording zone, are generated in both a recording mode and a reproducing mode. A reference frequency signal means, for generating an oscillating signal of a reference frequency, is combined with a variable frequency forming phase locked circuit. A first switch selectively causes the phase locked circuit to perform the phase locking in response to the reference frequency signal generated from the reference signal means or the reproducing signal. A demultiplying means switches a demultiplying ratio according to the mode.

REFERENCES:
patent: 4894734 (1990-01-01), Fischler et al.
patent: 4964109 (1990-10-01), Yoshioka

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