Magnetic disk apparatus and magnetic disk access controlling...

Details Magnetic disk apparatus and magnetic disk access controlling... Magnetic disk apparatus and magnetic disk access controlling...

2009-06-05

2010-12-28

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

C360S077080

Reexamination Certificate

active

07859779

ABSTRACT:
A magnetic disk apparatus includes a magnetic disk, a magnetic head, a servo reproduction signal generator and a magnetic head controller. The disk includes a data recording area and a servo-pattern area. The data recording area includes a non-magnetic area scattered with magnetic regions, and the servo-pattern area includes uniformly magnetized magnetic regions larger than the magnetic regions in the recording area. The magnetic head reciprocates radially of the disk, giving a magnetization direction to the magnetic regions in the data recording area and reading the magnetization direction of the magnetic regions in the data recording area and the servo-pattern area. The servo reproduction signal generator reads the servo-pattern area, using the magnetic head, via an absolute-value calculation circuit to generate a servo reproduction signal before the recording or reading with respect to the data recording area. The magnetic head controller performs recording or reproducing with respect to the data recording area by controlling the magnetic head based on the servo reproduction signal.

REFERENCES:
patent: 7630156 (2009-12-01), Okawa et al.
patent: A 63-149884 (1988-06-01), None
patent: A 2003-157507 (2003-05-01), None
patent: A 2004-110896 (2004-04-01), None
patent: A 2006-31859 (2006-02-01), None
patent: A 2007-226918 (2007-09-01), None

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