Device for compensating unequal write fields in magnetic data-st

Details Device for compensating unequal write fields in magnetic data-st Device for compensating unequal write fields in magnetic data-st

1979-06-28

1981-12-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 61, 360124, G11B 509

Patent

active

043039510

ABSTRACT:
A device for compensating for an inequality between the d.c. magnetic fields set up by the two oppositely acting windings, respectively, of the magnetic heads of a data storage device, particularly a disc memory, and a data storage apparatus including such a device, the device comprising means for generating a compensating direct current and feeding this current at the appropriate time to a predetermined one of the two windings of the magnetic heads. The magnitude of the compensating direct current is advantageously adjusted in dependence on the instantaneous magnitude of the write current.

REFERENCES:
patent: 3092817 (1963-06-01), Piament
patent: 3503059 (1970-03-01), Ambrico
patent: 3665485 (1972-05-01), Pear, Jr.
patent: 3838448 (1974-09-01), Garde et al.
patent: 4021853 (1977-05-01), Murphy
patent: 4037258 (1977-07-01), Chari
"Bit Displacement Compensation For High-Density Recording" by W. R. Hahs, IBM TDB, vol. 14 #11, 4/72.

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