Improved method and syste mfor magnetic head to unload

A magnetic head unloading, magnetic head technology, applied in the recording of information on the magnetic disk, the configuration/installation of the recording head, magnetic recording, etc., can solve the problem of unstable speed, weight and other problems
CN1492396AInactive Publication Date: 2004-04-28YITUO SCI & TECH CO LTD SHENZHEN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YITUO SCI & TECH CO LTD SHENZHEN
Publication Date
2004-04-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides improved method and system for magnetic heat to unload. While unloading magnetic head and in case of some power fault, the present invention can limit the maximum and minimum rate of the actuator. One counter electromotive force control circuit is used to compare the standard actuator rate and current actuator rate and has one inducing resistor to eliminate impedance of the actuator. In case of rate exceeding safety range, the counter electromotive force control circuit will reduce the current through the actuator to avoid ever greater acceleration, and vice versa.
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Description

【Technical field】

[0001] The invention relates to an improved method and system for magnetic head unloading of a disk drive. During the sudden unloading process of the magnetic head, its motor control system controls the speed of the magnetic head by controlling the actuator. 【technical background】

[0002] Disk drives used in portable or battery-powered devices are always affected by changes in their power supply systems, such as sudden loss of power supply or power failure. When this happens, the head will crash against the disk, causing damage to both the read and write heads and the disk. To this end, the industry has introduced dynamic head unloading technology. If this technology is applied to the magnetic head, the unloading operation will be successfully performed without the above-mentioned destructive impact. In US Patent No. 4933785 "Disk Drive Applied with Dynamic Head Loading / Unloading Technology", such a head unloading method is proposed, which uses a rotatin...

Claims

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