Vibration detector for hard disk drives

Details Vibration detector for hard disk drives Vibration detector for hard disk drives

2008-07-15

2008-07-15

Nguyen, Hoa T. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000, C360S077080

Reexamination Certificate

active

07400468

ABSTRACT:
A hard disk drive with a circuit that provides a control signal to a voice coil motor to move a head across a disk. The disk drive includes a circuit that provides a control signal to the voice coil motor to move the head. The circuit also has a state predictor and an inversion filter that compute a vibration estimate used to detect a vibration in the drive. When a threshold vibration is detected a vibration estimate is combined with the control signal to compensate for the vibration. The circuit detects the vibration without the need for an accelerometer or other sensor.

REFERENCES:
patent: 5229896 (1993-07-01), Tohyama et al.
patent: 6097565 (2000-08-01), Sri-Jayantha et al.
patent: 7292403 (2007-11-01), Baek et al.
patent: 7319570 (2008-01-01), Jia et al.
patent: 2007/0064334 (2007-03-01), Jia et al.

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