Portable computer hard disk protective reflex system

Details Portable computer hard disk protective reflex system Portable computer hard disk protective reflex system

1994-04-06

1996-06-11

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

371 48, G11B 2120, G06F 1100

Patent

active

RE0352691

ABSTRACT:
A protective reflex system for a portable computer hard disk initiates protective action before the hard disk suffers the shock of an impact in the event they fall from, for example, a user's lap. A three axis accelerometer is mounted in the portable computer. The output of the accelerometer is continuously monitored by a dedicated processor. In the event of an acceleration event within a preset range of values, the dedicated processor passes a high priority interrupt to the central processing unit of the portable computer and then proceeds to park the disk heads. Alternately, the interrupt routine of the central processing unit may also cause the park operation. In addition to park operation, a brake operation may be performed by either the dedicated processor or the central processing unit.

REFERENCES:
patent: 4040103 (1977-08-01), White
patent: 4692915 (1987-09-01), Moriya et al.
patent: 4862298 (1989-08-01), Genheimer et al.
patent: 4897743 (1990-01-01), Kohno
patent: 5235472 (1993-08-01), Smith
H. R. Ottesen; "Apparatus for Detecting and Correcting Excessive Vibration in a Disk File", IBM Technical Disclosure Bulletin, vol. 30, No. 6, Nov. 1987, p. 81.

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