Disk drive comprising asynchronous/synchronous gain control...

Details Disk drive comprising asynchronous/synchronous gain control... Disk drive comprising asynchronous/synchronous gain control...

2005-04-19

2005-04-19

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

C360S046000, C360S067000

Reexamination Certificate

active

06882486

ABSTRACT:
A disk drive is disclosed comprising a plurality of disk surfaces and a plurality of respective heads actuated radially over the disk surfaces. Each disk surface comprises a plurality of tracks, each track comprising a plurality of data sectors and a plurality of embedded servo sectors, each embedded servo sector comprising a servo sync mark for synchronizing to the embedded servo sector. When the disk drive switches heads, a detection window for detecting the servo sync mark is opened early. An asynchronous gain control algorithm prevents a gain control system from diverging while reading an area of the disk surface preceding the servo sync mark, and a synchronous gain control algorithm maintains a proper gain of the read signal while reading the servo sync mark.

REFERENCES:
patent: 5438460 (1995-08-01), Coker et al.
patent: 5966258 (1999-10-01), Bliss
patent: 5969895 (1999-10-01), Ueda et al.
patent: 6067206 (2000-05-01), Hull et al.
patent: 6111710 (2000-08-01), Feyh et al.
patent: 6175458 (2001-01-01), Carlson
patent: 20020109932 (2002-08-01), Aikawa et al.

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