Disk drive and control method therefor

Details Disk drive and control method therefor Disk drive and control method therefor

2007-04-20

2009-08-18

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040

Reexamination Certificate

active

07576937

ABSTRACT:
Embodiments in accordance with the present invention provide a disk drive capable of verifying whether the speed of an actuator is true or not, the speed being detected while the actuator is being moved between a retracted position and a recording surface of a magnetic disk, and to provide a control method for controlling the disk drive. In a particular embodiment, a hard disk drive (HDD) comprises: a head for accessing a disk; an actuator for supporting the head, the actuator being driven by a voice coil motor (VCM); a speed monitor for, on the basis of a cylinder ID written to the disk, monitoring the speed of the actuator while the actuator is being moved between a ramp which is provided outside a data area of the disk and the data area; and a speed verifier for, if an abnormal speed condition of the actuator is detected by the speed monitor, verifying the abnormal speed condition on the basis of the counter electromotive voltage of the VCM. If the speed based on the counter electromotive voltage is also abnormal, the speed verifier records the speed as the overspeed.

REFERENCES:
patent: 6995945 (2006-02-01), Kohso et al.
patent: 2003/0035240 (2003-02-01), Takeuchi et al.
patent: 2007/0279797 (2007-12-01), Hansen et al.
patent: 2008/0030891 (2008-02-01), Kim et al.
patent: 09-091901 (1997-04-01), None
patent: 2005293839 (2005-10-01), None

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