HP CD-Writer Plus User Manual page 25

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2. Unplug the CD-Writer Plus's power supply from the outlet or power strip.
(The power plug and outlet may look different in your country.)
NOTE: There is no power switch on the CD-Writer Plus drive or power supply.
You may safely unplug the power supply without damage to the CD-Writer Plus
drive.
3. Disconnect the CD-Writer Plus data cable and audio cable (if any) from
the back of the computer.
Moving CD-Writer Plus to Another Computer
Power supply
Data cable