Method and apparatus for detecting abnormal operation of moving

Details Method and apparatus for detecting abnormal operation of moving Method and apparatus for detecting abnormal operation of moving

1988-01-14

1989-10-03

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 67, G11B 2736, G11B 502

Patent

active

048720712

ABSTRACT:
A method and apparatus for detecting abnormal operation in a magnetic disk file which comprises reading data for each head and each track to obtain a readback signal. The readback signal is read from a predetermined area of each track on a disk that is not normally rewritten during normal operation of the system. The amplitude of the signal read from one track is compared with the amplitude of the signals read from other tracks, and an alarm condition when the comparison indicates a variation which exceeds a predetermined level. Corrective action can be taken in response to the alarm condition prior to an actual failure condition in the magnetic disk file.

REFERENCES:
patent: 3183516 (1965-05-01), Sliter
patent: 3456249 (1969-07-01), Pear
patent: 4146911 (1979-03-01), Gyi et al.
patent: 4516162 (1985-05-01), West
"The Reproduction of Magnetically Recorded Signals", The Bell System Technical Journal, vol. 30, Oct. 1951, pp. 1145-1173, by R. L. Wallace, Jr.
IBM Tech. Discl. Bull., vol. 11, No. 12, May 1969, p. 1650, entitled "Head Flight Height Monitoring", by A. A. Gaudet et al.
IEEE Trans. on Magnetics MAG-17, No. 4, Jul. 1981, pp. 1372-1375, "Effect of Flying Height Variation on Offtrack Data Handling", by F. Morris et al.

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