HP Compaq d330 DT Hardware Reference Manual page 33

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Hardware Reference Guide
6. Install the drive by sliding it into the appropriate drive bay on the
front of the chassis. The drivelock automatically secures the drive
in the bay.
Installing Optical and Diskette Drives into the Drive Bays
CAUTION: Make sure the guide screws line up with the guide slots in the
drive cage. The use of unnecessary force when installing any drive into the
drive bay may result in damage to the drive.
7. When installing an optical drive, the default audio solution is
digital audio. If analog audio is preferred, connect the audio cable
from the drive to the embedded audio connector on the system
board.
8. Connect the data and power cables on the back of the drives.
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