Epson EL 3S/33 - Manual (Page 66)

Installing the Hard Disk Below the Mounting Bracket
If you have a third-height hard disk drive, you can install it
below the hard disk drive mounting bracket. Refer to the
illustrations below and follow these steps:
1. Remove the screw securing the mounting bracket to the base
of the computer.
2. Slide the mounting bracket toward the diskette drive bays
until the slots clear the tabs.
3. Lift the mounting bracket out of the computer and set it
aside.
Installing and Removing Drives 4-7