Disk drive clock writer

Details Disk drive clock writer Disk drive clock writer

1988-11-01

1991-02-26

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

049966081

ABSTRACT:
A clock pattern writer for a disk drive, having circuitry to write a preliminary clock pattern having a number of clock pulses approximately equal to a desired predetermined number of clock pulses. A second clock pattern having the predetermined number of clock pulses is written by correcting the preliminary pattern as appropriate to achieve the desired number of clock pulses. In the illustrated embodiment, a phase lock loop generates a source signal in phase with the preliminary clock pattern and correction circuitry repeatedly advances or retards the phase of selected individual pulses of the source signal so that the second clock pattern has the predetermined number of clock pulses. Preferably, phase transients in the clock pattern may be eliminated or reduced by writing a third clock pattern using a phase lock loop locked to the second clock pattern.

REFERENCES:
patent: 2926341 (1960-02-01), Scarbrough
patent: 3531787 (1970-09-01), Fuller
patent: 3668665 (1972-06-01), Reynolds
patent: 3893172 (1975-07-01), Celek
patent: 4414589 (1983-11-01), Oliver

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