Method and apparatus for preventing write operations in the pres

Details Method and apparatus for preventing write operations in the pres Method and apparatus for preventing write operations in the pres

1997-02-03

2000-09-05

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360 75, G11B 1904

Patent

active

061152005

ABSTRACT:
The present invention is a method and apparatus for preventing a write operation to a storage medium of a data storage system in response to a shock event which excites the component modes of the data storage system. In accordance with the invention, an apparatus is provided which determines the occurrence of a shock event which causes post-shock movement of the transducer resulting from excitation of one or more of the component modes of the data storage system, measures the movement of the transducer for at least a predetermined period of time after the shock event, and prevents the write operation until the movement of the transducer is less than a predetermined threshold throughout this predetermined period of time.

REFERENCES:
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patent: 4947093 (1990-08-01), Dunstan et al.
patent: 5333138 (1994-07-01), Richards et al.
patent: 5491394 (1996-02-01), Harwood et al.
patent: 5654840 (1997-08-01), Patton et al.
patent: 5663847 (1997-09-01), Abramovitch
patent: 5696645 (1997-12-01), Laughlin
patent: 5721457 (1998-02-01), Sri-Jayantha et al.
IBM Technical Disclosure Bulletin, "Optimal Means for Generating a Write Inhibit in Hard Disk Drives in Response to External Shock Using Accelerometers", vol. 39, No. 10, p. 131 (Oct. 1996).

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