Epson Endeavor 468C - Manual (Page 105)

Your computer can hold up to three drives in two horizontal
drive bays and one vertical drive bay.
The upper horizontal bay contains the diskette drive that came
with your system. If your system came with only one diskette
drive, you can install an additional device of one of the
following types in the lower horizontal drive bay:
q 5¼-inch-wide diskette drive, dual diskette drive, tape
drive, CD-ROM drive, or other storage device
q 3½-inch-wide hard disk drive with mounting frames
attached to it.
Installing and Removing Drives