Magneto-resistance effect type of recording/reproducing head

Details Magneto-resistance effect type of recording/reproducing head Magneto-resistance effect type of recording/reproducing head

1994-01-21

1995-10-24

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 66, G11B 509, G11B 503

Patent

active

054615178

ABSTRACT:
In a magnetic disk device having a composite head with an induction type of recording head adjacent a magneto-resistance effect type of reproducing head, a read error relief is provided to relieve read errors caused by Barkhausen Noise or Base Line Shift phenomenon inherent to the magneto-resistance effect type of reproducing head. Upon occurrence of a read error, a re-try function is first executed, and a track offset function is executed for relief of the read error. However, if the read error is not relieved after the offset operation and the re-try operation have been performed a predetermined number of times, then a pseudo write-in and/or read current control operation is performed together with the offset operation and/or re-try operation for a predetermined number of times. The control operation varies the magnetic domain structure in the head magnetic film (MR film). The variation of magnetic field and/or read current in the head magnetic film causes the magnetic domain structure of the head magnetic film to be varied, so that the Barkhausen Noise or the Base Line Shift phenomenon are extinguished.

REFERENCES:
patent: 4802033 (1989-01-01), Chi
patent: 5301080 (1994-04-01), Ottesen et al.
JP reference No. 01-263903, Abstract, Jan. 17, 1990.

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