Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2011-03-22
2011-03-22
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
Reexamination Certificate
active
07911724
ABSTRACT:
A technique is described for write synchronization phase calibration for storage media (e.g., bit patterned media). In one embodiment, a calibration write clock signal may be generated at a frequency offset from a nominal dot frequency of a bit patterned storage media. A periodic signal that was written to the media synchronous to the calibration write clock signal may then be read and mixed with a reference periodic signal at the nominal dot frequency to obtain a difference signal. This difference signal may be demodulated to determine a phase correction for write synchronization to the media.
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Buch Bruce Douglas
Vea Mathew P.
Holt Christopher L.
Seagate Technology LLC
Tzeng Fred
Westman Champlin & Kelly P.A.
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