Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-12-10
2010-02-02
Sniezek, Andrew L (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S051000, C360S077070
Reexamination Certificate
active
07656604
ABSTRACT:
A disk drive is disclosed comprising a disk including a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted by a sync mark at a sync mark interval, and a head actuated over the disk. The spiral tracks are demodulated by reading a spiral track to generate a spiral track crossing signal g(xn), where xnis a time in a demodulation window, and determining a position error signal (PES) by determining a time-shift L that maximizes a correlation between g(xn) and a function that estimates a nominal spiral track crossing signal having the time-shift of L.
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Liang Jiangang
Park Charles A.
Weerasooriya Siri S.
Sheerin, Esq. Howard H.
Sniezek Andrew L
Western Digital Technologies Inc.
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