Epson EL 486UC - Manual (Page 84)

2. Lift the mounting bracket out of the computer.
3. Turn the hard disk drive over and locate the four mounting
holes on the drive.
4. Position the bracket on the hard disk drive, aligning the
holes in the bracket with the holes on the drive.
5. Secure the bracket to the drive with four screws.
Installing and Removing Drives 4-11