Dell XPS/Dimension XPS Gen 4 - Manual (Page 111)

Removing and Installing Parts
111
2 Unsnap the top bracket hinge and pull the top of the drive door outward, away from the
computer.
3 Lift the bottom bracket hinge away from the computer.
Replacing the Drive Door
To prevent damage to your computer, the drive door is designed to "break away" from the computer
if it is opened too far. If the drive door detaches from the computer without disassembling, perform
the removal procedure in reverse.
top bracket hinge
bottom bracket hinge