Magnetic disk unit for detecting contact between a magnetic head

Details Magnetic disk unit for detecting contact between a magnetic head Magnetic disk unit for detecting contact between a magnetic head

1997-12-08

2000-04-18

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 25, 360 75, G11B 509, G11B 502, G11B 2102

Patent

active

060522437

ABSTRACT:
A magnetic disk unit is provided with a storage device for storing a signal output value in each position on a first circumference of a magnetic disk, and a contact detector for relating a signal output value in each position on a second circumference of the magnetic head slider to each position on the first circumference. The latter signal output values are standardized by dividing by the corresponding signal output value stored in the storage device. Contact between the magnetic disk and the magnetic head slider is detected if the standardized output exceeds a preset reference value. The contact detector outputs a signal for instructing an actuator control circuit to move the magnetic head slider to a predetermined home position if contact between the magnetic disk and the magnetic head slider is detected.

REFERENCES:
patent: 5822139 (1998-10-01), Ayabe

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