Epson EL 3S/33 - Manual (Page 61)

Installing a Hard Disk Drive in the Internal Drive Bay
Your computer may have a hard disk drive already installed
using the hard disk drive mounting bracket. If not, you can
install a l-inch (third-height), 3½-inch wide drive below the
mounting bracket or above it.
Here you will find steps for the following procedures:
Removing the mounting frames from the hard disk drive
(if necessary)
Connecting the hard disk drive cables
Installing the hard disk drive under the mounting bracket
(for third-height drives)
Installing the hard disk drive on the mounting bracket.
Note
Be sure to check the jumper settings on the drive before you
install a hard disk drive. Also, you will need to know the
number of cylinders, heads, sectors, etc. to select the correct
drive type in the SETUP program. See the documentation
that came with your drive for this information.
Before you can install a hard disk drive, you need to remove
any option cards that may be blocking your access to the hard
disk drive area. Once you have installed the drive, replace any
option cards you removed. See Chapter 3 for instructions.
4-2 Installing and Removing Drives