Dell Precision Workstation 450 Service Manual page 57

3. If you are installing a replacement drive and the new drive does not have the bracket rails attached, remove the rails from the old drive by removing
the two screws that secure each rail to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with the screw holes on
the bracket rails and then inserting and tightening all four screws (two screws on each rail).
1 drive
2 bracket rails (2)
3 screws (4)
4. Gently slide the drive into place until the tabs securely click into position.
5. If you are installing a drive that has its own controller card, install the controller card in an expansion slot.
See the documentation that accompanied the drive and controller card to verify that the configuration is correct for your computer.
6. Connect the power and CD/DVD drive cables to the drive.
If you are adding a drive that has an audio cable, connect the audio cable to the audio connector on the system board.