Control device, storage device, storage medium, servo data...

Details Control device, storage device, storage medium, servo data... Control device, storage device, storage medium, servo data...

2007-02-01

2008-12-09

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S077040, C360S078040, C360S078070

Reexamination Certificate

active

07463439

ABSTRACT:
A magnetic disk device includes a position and velocity demodulating circuit. In the position and velocity demodulating circuit, a difference calculating unit demodulates a moving velocity of a magnetic head based on a phase difference in servo signals as servo data in the same sector. An overflow detecting unit detects an overflow of the demodulated moving velocity and calculates a correction value for the overflow. The overflow is corrected based on the correction value. The corrected overflow is further corrected by a correction value of a repeatable velocity error for the demodulated velocity to output an accurate demodulated velocity.

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