Dell OptiPlex NX1 - Manual (Page 131)

Removing and Replacing Parts on the Mini Tower Chassis 6-15
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To remove the hard-disk drive assembly, follow these steps:
1. Remove the hard-disk drive bracket.
2. Remove the four screws that attach the hard-disk drive to the hard-disk
drive bracket.
One hard-disk drive attaches to the hard-disk drive bracket at the sides of
the drive. The other hard-disk drive attaches to the hard-disk drive bracket
at the bottom of the hard-disk drive.
3. Slide the drive out of the hard-disk drive bracket.
hard-disk drive
hard-disk
drive bracket
drive-mounting screws (4)
for bottom-mounted drive
sliding tab drive-mounting screws (4)
for side-mounted drive