Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2007-07-24
2007-07-24
Wellington, Andrea (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C360S077070, C360S075000
Reexamination Certificate
active
10903522
ABSTRACT:
A method of writing product servo sectors to a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted by a sync mark at a sync mark interval. The sync marks in the spiral tracks are detected to synchronize a servo write clock used to open a demodulation window during which the high frequency signal in the spiral tracks is demodulated to generate a position error signal for maintaining the head along a first servo track while writing product servo sectors along the first servo track. The demodulation window is then shifted by an integer number of sync mark intervals to initiate a seek to a second servo track. The head is then used to write product servo sectors along the second servo track.
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Lee Tehri S.
Weerasooriya Siri S.
Kapadia Varsha A.
Sheerin, Esq. Howard H.
Wellington Andrea
Western Digital Technologies Inc.
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