Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-06-11
1989-06-20
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360103, 324226, G11B 560, G11B 2102
Patent
active
048413895
ABSTRACT:
A self-diagnostic method and apparatus is described for indicating the likelihood of an impending crash of a magnetic transducer or head with a rotating magnetic medium by dynamically and periodically calculating overwrite efficiency for performing a desired control operation when it exceeds a preselected value denoting dangerous proximity of the transducer to the surface of the medium.
REFERENCES:
patent: 4146911 (1979-03-01), Gyi et al.
patent: 4777544 (1988-10-01), Brown et al.
A. A. Gaudet et al., "Head Flight Height Monitoring", IBM Technical Disclosure Bulletin, vol. 11, No. 12, May 1969, p. 1650.
R. L. Wallace, Jr., "The Reproduction of Magnetically Recorded Signals", The Bell System Technical Journal, vol. 30, Oct. 1951, pp. 1145-1173.
W. K. Shi et al., "Use of Readback Signal Modulation to Measure Head/Disk Spacing Variations in Magnetic Disk Files", Technical Report No. 11, The Center for Magnetic Recording Research, University of California, San Diego, Dec. 1985.
F. Morris et al., "Effect of Flying Height Variation on Offtrack Data Handling", IEEE Trans. on Magnetics MAG-17, No. 4, Jul. 1981, pp. 1372-1375.
Hoyt Roger F.
Jefferson Carl M.
Millman Steven E.
Canney Vincent P.
Garland Steven R.
International Business Machines - Corporation
Otto, Jr. Henry E.
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