Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2004-09-17
2008-10-07
Nguyen, Hoa T. (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C360S048000, C360S077070, C360S053000
Reexamination Certificate
active
07433143
ABSTRACT:
A method and apparatus is disclosed for adjusting the track density by changing the slope of spiral tracks used to servo write a disk drive. A target track density is established for a disk surface, and a plurality of spiral tracks are written to the disk surface in response to the target track density. Each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark, and a slope of the spiral tracks is selected in response to the target track density. The head internal to the disk drive is used to read the spiral tracks in order to write product servo sectors to the disk to define a plurality of data tracks, wherein the slope of the spiral tracks determines the density of the data tracks.
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Chue Jack M.
Lee Tehri S.
Weerasooriya Siri S.
Ying Wing
Mercedes Dismery
Nguyen Hoa T.
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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