Dell OptiPlex GX1p - Manual (Page 67)

To remove a 5.25-inch drive assembly from the middle or lower drive bay, follow these steps:
1. Disconnect the DC power cable and the interface cable from the back of the drive.
2. Press in on the 2 retaining tabs (one on each side of the drive), and slide the drive assembly forward to remove it.
3. Remove the 4 screws attaching the 5.25-inch drive to the mounting plate, and lift the drive out of the mounting plate.
When you replace the 5.25-inch drive, align the front of the drive flush with the tab at the front of the mounting plate. Insert the 4 screws, and tighten them in the order
stamped on the bottom of the 5.25-inch drive-mounting plate.
Hard-Disk Drive Bracket Removal
To remove the hard-disk drive bracket, follow these steps:
1. Disconnect the DC power cable and the interface cable from the back of each hard-disk drive installed in the hard-disk drive bracket.
CAUTION: The video memory module can be damaged when the hard-disk drive bracket is removed if the hard-disk drive's DC power cable
and the interface cable are not disconnected first.