Epson EISA Desktop - Manual (Page 96)

Installing
a Drive
On each interior side of the external drive bay, there is a plastic
guide with four support grooves, as shown below. You need to
select the appropriate grooves for your drive depending on the
size of the drive and where you want to locate it.
The third-height diskette drive that came with your computer
is installed in the grooves at the top of the bay.
instructions that came with the drive to install the frame.
6-6 Installing and Removing Drives