Magnetic read/write head that detects open and short-circuits

Details Magnetic read/write head that detects open and short-circuits Magnetic read/write head that detects open and short-circuits

1997-11-07

2000-06-27

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, G11B 509, G11B 502

Patent

active

060813962

ABSTRACT:
A read/write head for a magnetic medium magnetic is modified by the addition to it of a parallel-connected resistor and by the measurement of the difference in voltage at the terminals of this unit, on the one hand when the read/write head and the resistor are perfectly connected and, on the other hand, when one of the connections is in an open circuit condition or even in short-circuit condition with respect to ground. Consequently, a measurement is taken, preferably, of the state of connection of the read/write head when it is in read mode and not when it is in write mode. It is shown that far greater reliability in the detection of this type of defect is obtained, in avoiding false alarms.

REFERENCES:
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patent: 4533965 (1985-08-01), Steinbaugh
patent: 5087884 (1992-02-01), Brannon
patent: 5357379 (1994-10-01), Gower
patent: 5392172 (1995-02-01), Yoshinaga et al.
patent: 5457391 (1995-10-01), Shimizu et al.
Fujitsu Ltd, Patent Abstracts of Japan, "Detecting Circuit for Defective Insulation of Magnetic Head", Publication No. 61094212, May 1986.
Fujitsu Ltd, Patent Abstracts of Japan, "Detection for Disconnection of Magnetic Head", Publication No. 59178616, Sep. 1984.
Fujitsu Ltd, Patent Abstracts of Japan, "Writing Circuit of Magnetic Head", Publication No. 57189316, Nov. 1982.
Comput Basic Mach Technol Res Assoc, Patent Abstracts of Japan, "Magnetic Head Assembly", Publication No. 60000617, May 1985.
2244 Research Disclosure, Jul. 1986, No. 267, Emsworth, Hampshire, Great-Britain, 26755 "Disk File Defect Strategy".

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