Dell Precision 330 - Manual (Page 27)

6. Remove the four screws that secure the drive in the bracket (see the following figure).
7. Remove the drive from the bracket
Removing a Hard Drive from the Bracket (Mini Tower Chassis)
Replacing a Hard Drive (Mini Tower Chassis)
1. Slide the drive into one of bracket bays, oriented so that the connectors on the back of the drive will face the interior of the chassis when the bracket is
reinstalled. See " Removing a Hard Drive from the Bracket (Mini Tower Chassis) ."
2. Align the screw holes of the drive and bracket, and secure the drive in the bracket using the screws that came with the upgrade kit.
3. Reinstall the hard-drive bracket in the chassis (see the following figure).
Insert the drive bracket into the chassis, sliding it in until the tabs snap into place. Rotate the drive door upward to the chassis until it snaps securely into place.
NOTE: Orient the drive in the bracket so that its bottom will face the left side of the chassis when the bracket is installed in the chassis.