Disk drives and disk drive containing devices that include a...

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2006-07-11

2006-07-11

Nguyen, Hoa T. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077080

Reexamination Certificate

active

07075746

ABSTRACT:
A disk includes an actuator assembly, a spindle motor and a disk that defines a plurality of servo wedges. A wedge to wedge timer is configured to measure the time elapsed between at least two circumferentially adjacent servo wedges and to output a wedge to wedge correction signal that defines a count between circumferentially adjacent servo wedges that is dependent upon the measured elapsed time. A servo frequency generator is configured to output a servo frequency generator signal having a frequency that is modulated by the wedge to wedge correction signal. A spindle motor control timer outputs a spindle control timer signal that is dependent upon the servo frequency generator signal and upon the time elapsed between at least two successive detections of circumferentially adjacent servo wedges. A spindle motor controller controls the spindle motor with a control signal that changes according to the spindle control timer signal.

REFERENCES:
patent: 5477103 (1995-12-01), Romano et al.
patent: 6611391 (2003-08-01), Murphy et al.
patent: 6972540 (2005-12-01), Wang et al.
patent: 2003/0012101 (2003-01-01), Park

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