Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2008-05-18
2010-12-28
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
Reexamination Certificate
active
07859782
ABSTRACT:
A method is disclosed for demodulating a spiral servo track recorded on a disk of a disk drive. The spiral servo track comprises a high frequency signal interrupted by a sync mark at a sync mark interval. A demodulation window is enabled relative to a spiral servo track crossing, and a plurality of sync marks are detected in a sync mark window of the demodulation window. A reliability metric is generated for each of the detected sync marks, wherein the reliability metrics are evaluated to select one of the detected sync marks. A clock is synchronized in response to the selected sync mark.
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Tzeng Fred
Western Digital Technologies Inc.
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