Disk drive for quickly retracting head to retract area, and...

Details Disk drive for quickly retracting head to retract area, and... Disk drive for quickly retracting head to retract area, and...

2007-04-17

2007-04-17

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

11038049

ABSTRACT:
A reset circuit asserts a reset signal when at least a power-off detection signal or a drop detection signal is asserted. When the reset signal is asserted, an emergency unload circuit supplies a voice coil motor with a current for retracting the head to the retract area. The emergency unload circuit uses an auxiliary power supply as an operation power supply thereof.

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Austrian Search Report dated Oct. 12, 2006 for Appln. No. 200500251-4.
Williams, R.K. et al.; A fully integrated HDD power IC with novel head retract feature; Proceeding of the 6thInternational Symposium on Power Semiconductor Decices and IC's; May 31-Jun. 2, 1994; pp. 391-396.

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