Servo detection control system, servo detection control...

Details Servo detection control system, servo detection control... Servo detection control system, servo detection control...

2005-11-08

2005-11-08

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

C360S051000, C360S077040

Reexamination Certificate

active

06963462

ABSTRACT:
For the purpose of providing technique by which even when large skew of a disk or a head occurs due to a thermal shock, an outside shock, or the like, a servo signal area is not extended, and a performance loss caused by head change is not produced, a servo detection control system according to the present invention comprises: a learning means by head change including a servo sector interval measuring unit for measuring an interval of servo signal areas, which may occur at the time of head change among a plurality of heads; a time difference calculating unit for calculating head-change time difference from a value measured by the servo sector interval measuring unit; and a time difference storage unit for storing a result of calculation made by the time difference calculating unit; and a compensation and control means for compensating start timing of servo detection after head change using a stored value of the time difference storage unit. In addition, the amount of head skew in a disk radius direction is measured using a writing signal in a servo sector after head change; and positioning of feed-forward of a head is controlled using the amount of head skew.

REFERENCES:
patent: 6067206 (2000-05-01), Hull et al.
patent: 6128153 (2000-10-01), Hasegawa et al.
patent: 6515813 (2003-02-01), Kitazaki et al.
patent: 2001/0013984 (2001-08-01), Takaishi

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