Stepper motor data recovery method using a magnetic hysteresis b

Details Stepper motor data recovery method using a magnetic hysteresis b Stepper motor data recovery method using a magnetic hysteresis b

1987-08-14

1989-03-14

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 53, 360 7813, G11B 555, G11B 556

Patent

active

048129283

ABSTRACT:
A method and system using the magnetic hysteresis of a stepping motor to offset the position of a transducer relative to a disk target track during data recovery. The data recovery is accomplished by energizing selected phases of the stepping motor while moving to the target track and then de-energizing a selected phase during the final movement to the target track which results in the transducer being offset from the target track so that illegible information can be recovered.

REFERENCES:
patent: Re31166 (1983-03-01), Korda
patent: 3956766 (1976-05-01), Hanson et al.
patent: 4516165 (1985-05-01), Cunningham et al.

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