| 摘要 |
In a magnetic disk storage apparatus, when power supply is stopped, a magnetic head can be retracted safely and quickly so as not to be damaged. There are provided a back electromotive force detecting means that detects back electromotive forces developed in coils of a voice coil motor for moving a magnetic head when power supply is stopped, and a brake control means that judges a movement speed of the magnetic head from the detected back electromotive forces, and brakes the voice coil motor when the movement speed is greater than a preset first limited speed.
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