Method and apparatus adjusting reference clock frequency and...

Details Method and apparatus adjusting reference clock frequency and... Method and apparatus adjusting reference clock frequency and...

2011-05-31

2011-05-31

Negrón, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

Reexamination Certificate

active

07952825

ABSTRACT:
Provided is an apparatus and method of adjusting reference clock frequency in a disk drive. The reference clock frequency adjustment method includes; measuring each servo sector detection time interval, generating an error signal by subtracting initially set reference time interval information between servo sectors from the measured servo sector detection time interval information, and adjusting the reference clock frequency using the error signal such that a constant number of reference clock pulses are generated in each servo sector detection time interval regardless of variation in each servo sector detection time interval.

REFERENCES:
patent: 5128809 (1992-07-01), Leis et al.
patent: 5535067 (1996-07-01), Rooke
patent: 5724204 (1998-03-01), Shinohara et al.
patent: 5903410 (1999-05-01), Blaum et al.
patent: 2007/0081266 (2007-04-01), Buch et al.

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