| 摘要 |
PROBLEM TO BE SOLVED: To provide a control technology for a voice coil motor to enable a magnetic head to move to the standby position, even though the power supply is interrupted when the rotation of a spindle motor of a magnetic disk storage device is slow. SOLUTION: In the magnetic disk storage device furnished with the spindle motor 310 for rotating the magnetic disk, a spindle motor driver 110 for rotationally driving this motor, the voice coil motor 340 for moving the magnetic head, and a voice coil motor driver 120 for driving the voice coil motor 340, the rotation speed of the spindle motor 310 is made slower than the rotation speed at the normal operation when the magnetic head is loaded on the surface of the magnetic disk from the standby position. Then, a voltage higher than the back electromotive voltage is generated in the spindle motor driver by the operation of a step-up converter when the power supply is interrupted, then a control circuit and a driving circuit are operated so that the speed is controllable at the time when the magnetic head is moved to the prescribed standby position. COPYRIGHT: (C)2004,JPO
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