Dell DIMENSION 3000 SYSTEMS DMC Owner's Manual page 64

3
If you are replacing the hard drive, remove the drive from the bracket:
Remove the hard drive-securing screws.
a
Remove the hard drive from the bracket.
b
small bracket
tabs (2)
64
Removing and Installing Parts
drive bracket
hard drive
bracket-securing
screw
drive bracket
bracket-securing
screw
drive-securing
screws (3)