| 摘要 |
An external optical disc drive, connected to a bus from which a supplying voltage and a supplying current are outputted, includes: a voltage detector connected to the bus for receiving and detecting the supplying voltage; a digital signal processor connected to the voltage detector; a motor driver connected to the digital signal processor; and a spindle motor connected to the motor driver; wherein a speed-control signal, for informing the digital signal processor to lower the speed of the spindle motor via the motor driver, is outputted to the digital signal processor from the voltage detector while the supplying voltage is detected lower than a threshold voltage.
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