Disk drive

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

Reexamination Certificate

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Reexamination Certificate

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07075745

ABSTRACT:
In a disk drive apparatus for forcibly restoring a head to a retract position when a power voltage is greatly lowered, the head is moved in a direction toward the retract position when detecting a small decrease in the power voltage.

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www.interfacebus.com; Logic Threshold Voltage Levels.

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