Magnetic disk drive

Details Magnetic disk drive Magnetic disk drive

1992-04-28

1994-03-15

Look, Edward K.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7812, G11B 5596

Patent

active

052950263

ABSTRACT:
The present invention provides a magnetic disk drive for recording data on and reproducing recorded data from magnetic disk having a servocontrol data zone in which servocontrol data is stored. The magnetic disk drive includes a magnetic head shifting device for shifting a magnetic head unit radially with respect to the magnetic disk, and a voice coil motor for driving the magnetic head shifting device. A control means controls the voice coil motor so as to decelerate the magnetic head shifting device to a stop when a failure to read servocontrol data occurs a predetermined number of times while the magnetic head shifting device is being driven during a target track seek operation. Thus, a collision of the magnetic head unit against the magnetic disk can be prevented.

REFERENCES:
patent: 3156906 (1964-11-01), Cummins
patent: 4967291 (1990-10-01), Touchton et al.
patent: 5140476 (1992-08-01), Kim

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