Dell Precision 490 - Manual (Page 84)

8. If no screws are attached to the drive, check the inside of the drive panel for shoulder screws and attach them to the new drive.
9. Gently slide the drive into place until you hear a click or feel the drive securely installed.
10. Attach the power and data cables to the CD/DVD drive.
11. If you are installing an IDE drive, another CD/DVD drive may be attached to the same data cable by another connector. The other end of the data cable
should connect to the system board connector labeled "IDE." To locate the system board connector, see
System Board Components .
If you are installing a SATA drive, connect the other end of the data cable to a SATA connector on the system board.
1 CD/DVD drive
2 screws
1 sliding-plate lever
2 CD/DVD drive
1 IDE data cable
2 power cable