Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
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.
Fukuoka Hirotsugu
Miyamoto Norifumi
Nakanishi Eiji
Narishige Shinji
Shiiki Kazuo
Hitachi , Ltd.
Kim W. Chris
Psitos Aristotelis
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