Dell Dimension XPS 50 Reference Manual page 56

3-10 Dell Dimension XPS Txxx and Txxxr Systems Reference and Troubleshooting Guide
6. Slide the drive assembly into the drive bay, and secure it to the drive cage with
one screw on each side as shown in Figure 3-9.
NOTE: Be sure to use the 1/4-inch drive-bracket mounting screw (removed in
step 4) on the right side of the drive and the smaller (3-mm) screw on the left side.
1/4-inch
drive-bracket
mounting screw
3-mm screws for
drive assembly (3)
drive bracket