Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2006-02-28
2006-02-28
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C048S053000
Reexamination Certificate
active
07006316
ABSTRACT:
A method of estimating a writer/reader gap in a disk drive is disclosed. During a first revolution of the disk, a clock is synchronized to a first preamble and used to measure a write delay to write a second sync mark to the disk relative to a first sync mark. During a second revolution of the disk, the clock is again synchronized to the first preamble and used to measure a read delay required to detect the second sync mark relative to the first sync mark. The writer/reader gap is then estimated in response to the measured write delay and the measured read delay, for example, by computing a difference between the measured write delay and the measured read delay.
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Bui Khoa Xuan
Sargenti, Jr. William A.
Tan Alvin W.
Yeo Teik E E
Hudspeth David
Negrón Daniell L.
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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