Magnetic recording and reproducing apparatus with thermal asperi

Details Magnetic recording and reproducing apparatus with thermal asperi Magnetic recording and reproducing apparatus with thermal asperi

1994-08-05

1998-02-03

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 46, G11B 502, G11B 509

Patent

active

057151105

ABSTRACT:
In a magnetic disk apparatus of high-speed data transfer, in order to cover an uncompensable section of the thermal asperity by error code correction to shorten the uncompensable section, upper and lower envelopes of a reproduced waveform are detected to obtain a level variation waveform due to the thermal asperity and subtract it from the reproduced signal. A thermal asperity processing circuit shown in FIG. 1 for compensating for the thermal asperity is used. In an envelope detection circuit in the thermal asperity processing circuit, a forced charge and discharge current control circuit is used in the thermal asperity portion to thereby be able to improve the follow-up characteristic to level variation of the thermal asperity and shorten the uncompensable section.

REFERENCES:
patent: 4774601 (1988-09-01), Ouchi et al.
patent: 4914398 (1990-04-01), Jove et al.
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5353176 (1994-10-01), Kosuge
IEEE Trans. Magn., vol. 27, No. 6, Nov. 1991, pp. 4503-4508 Magnetic Recording Channel Front-Ends, Klaassen, K. B.
IEEE, Trans. Magn., vol. 28, No. 5, Sep. 1992, pp. 2731-2732 Gailbraith, R. L., Kerwin C. S., Poss, J. M. Magneto-Resistive Head Thermal Asperity Digital Compensation.
IEEE, Trans. Magn., vol. 28, No. 5, Sep. 1992, pp. 2548-2550 Thin Film Thermocouple Sensors for Measurement of Contact Temp. Schreck, E., Fontana, E., Singh, G. P.

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