Disk drive and method for minimizing shock-induced damage

Details Disk drive and method for minimizing shock-induced damage Disk drive and method for minimizing shock-induced damage

1993-12-15

1999-11-09

Kim, W. Chris

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 60, G11B 2102, G11B 1504

Patent

active

059825731

ABSTRACT:
A disk drive has a fall detection control system that detects when a disk drive is in a free fall, and takes precautionary protective action to minimize physical damage from any resulting shock upon impact. The disk drive includes an accelerometer device that measures acceleration of the disk drive along three mutually orthogonal axes x, y, and z and resolves the measurement into respective vectors a.sub.x, a.sub.y, and a.sub.z. In one embodiment, a processor is programmed to (1) compute a net acceleration a.sub.net of the disk drive, (2) compare the net acceleration a.sub.net with the selected acceleration threshold level, (3) measure a duration that the net acceleration a.sub.net exceeds the acceleration threshold level, (4) compare the measured duration with a selected reference time period, and (5) output the warning signal when the measured duration exceeds the reference time period. Upon receipt of the warning signal, a controller initiates protective routines in preparation for shock.

REFERENCES:
patent: 5227929 (1993-07-01), Comerford
"Active Compensation of Shock, Vibration, and Wind-up in Disk Drives" by: David B. Davis & Michael D. Sidman; Jul. 10, 1992 (revised Nov. 28, 1991).

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