Asus DRW-1604P - Manual (Page 16)

16 ASUS DRW-1604P DVD±R/RW drive
3. Secure the drive with screws that came with the drive package. Use
two screws on each side of the drive.
Depending on the space on your chassis, you may need to connect the
drive cables before securing the drive into the chassis. For cable
connections, proceed to the following section, “Connecting the Drive
Cables.”