Dell OptiPlex Gxi - Manual (Page 110)

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 four screws, and tighten them in the
order stamped on the bottom of the 5.25-inch drive-mounting plate.
Hard-Disk Drive Bracket Removal
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.
2. Remove the screw that secures the hard-disk drive bracket to the drive cage in the chassis.
3. Grasp the bracket and rotate it outward from the chassis until the sliding tab clears the slide rail on the drive cage.
4. Lift the hard-disk drive bracket up slightly to free the hinge tabs and remove from the computer.
When you reinstall the hard-disk drive bracket, insert the bracket's hinge tabs into the chassis slots so that the tabs hook over the slots. Then rotate the bracket toward
the drive cage, and fit the bracket's sliding tab on the drive-cage slide rail.
Hard-Disk Drive Removal