Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2008-02-11
2010-11-23
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
Reexamination Certificate
active
07839591
ABSTRACT:
A disk drive is disclosed comprising a disk and a head actuated over the disk. 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. A first spiral track comprises a first sync mark from an outer diameter of the disk to a reference radial location and a second sync mark from the reference radial location toward an inner diameter of the disk. A second spiral track comprises the second sync mark from the outer diameter of the disk to the reference radial location and the first sync mark from the reference radial location toward the inner diameter of the disk. The first sync mark is different than the second sync mark.
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Clawson William W.
Weerasooriya Siri S.
Tzeng Fred
Western Digital Technologies Inc.
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