Dell Dimension 5100C - Manual (Page 19)

6. Disconnect the interface cable from the system board.
Installing a Floppy Drive
1. Follow the procedures in " Before You Begin ."
2. Remove the computer cover .
3. Slide the drive into place until you feel a click or feel the drive securely installed.
4. Attach the interface cable to the system board.
NOTE: The interface cable is held in place by the metal drive bracket and does not need to be removed from the drive.
NOTE: If the replacement or new floppy drive does not have the shoulder screws, use the screws in the drive-panel insert.