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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

Inactive Publication Date: 2004-04-28
YITUO SCI & TECH CO LTD SHENZHEN
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Problems solved by technology

However, this exacerbates the unstable velocity problem when the head is positioned close to the outer diameter of the disk, so an optimized unloading mechanism requires a different mode of operation based on whether the head is closer to the inner or outer disk diameter. judgmental

Method used

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  • Improved method and syste mfor magnetic head to unload
  • Improved method and syste mfor magnetic head to unload
  • Improved method and syste mfor magnetic head to unload

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Embodiment Construction

[0028] In order to solve the defects of the prior related art, the present invention discloses a head unloading system, which utilizes an actuator back EMF control circuit. This circuit controls the speed of the read / write head by adjusting the actuator current, and, when the power fails, the head is positioned close to the inner diameter of the disk, preventing the head from accelerating beyond the safe standard speed, or the head positioned close to the disk When the outer diameter is larger, the velocity of the read / write head is increased to prevent the head from hitting the unload cam.

[0029] see Figure 6, the disk device is controlled by the CPU through the CPU interface 180 . Amplifier 660 regulates the current flow from the rectifier to actuator 120 . The actuator back EMF control circuit 620 regulates the current generated from the actuator 120 and monitors the voltage across the actuator 120 by measuring the velocity of the head to which the sense resistor 640 i...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/48G11B19/20
Inventor 迈克尔・尤坦里克丹・汉特詹姆士・琼斯托马斯・安德鲁
Owner YITUO SCI & TECH CO LTD SHENZHEN
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