Magnetic disk device and read/write method

Details Magnetic disk device and read/write method Magnetic disk device and read/write method

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

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