Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2005-06-29
2009-02-03
Feild, Joseph H (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
Reexamination Certificate
active
07486461
ABSTRACT:
Embodiments of the invention eliminate the unnecessary disk format margin to raise the format efficiency. In one embodiment, a disk control unit (MPU) predicts the variation of the next servo sector pulse interval based on each learnt servo sector pulse interval. From this predicted interval, an optimal variation of the data sector pulse interval is determined for the current servo sector pulse. This optimal variation is set to an internal register of the hard disk controller (HDC). Based on this set variation, an internal calculation circuit calculates a corrected data sector pulse interval. Thus, data sector pulses are output at intervals optimized on an individual servo sector basis.
REFERENCES:
patent: 5506735 (1996-04-01), Okazaki
patent: 6937410 (2005-08-01), Koyanagi
patent: 2004/0114269 (2004-06-01), Ito
Fujii Yoshikatsu
Isono Soichi
Ooura Tomoki
Tsukada Minoru
Duncan Patrick
Feild Joseph H
Hitachi Global Storage Technologies - Netherlands B.V.
Negrón Daniell L
Townsend and Townsend / and Crew LLP
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