Magnetic disk drive

Details Magnetic disk drive Magnetic disk drive

1989-11-30

1991-12-03

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 554

Patent

active

050704206

ABSTRACT:
A magnetic disk drive which releases adhesion between a magnetic head and a magnetic disk by radially moving the head before the disk begins to rotate. The head movement is accomplished by compressing an elastic stopper by driving a head actuator motor with drive current which flows at half of the voltage previously applied to a motor drive circuit. This is accomplished by grounding one terminal of the motor and forcing all of the motor drive transistors OFF except for one transistor in the motor drive circuit. This provides the benefit that smaller and cheaper transistors can be used and power consumption is considerably reduced, thus contributing to a smaller, cheaper drive circuit which consumes less power.

REFERENCES:
patent: 4530021 (1985-07-01), Cameron
patent: 4589036 (1986-05-01), Bertschy
patent: 4897743 (1990-01-01), Kohno
patent: 4907106 (1990-03-01), Yamada

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