Epson Progression U12 - Manual (Page 109)

Installing a Drive in the External Bay
This section describes how to install an Epson diskette drive;
however, you can use these instructions to install another type
of storage device in the external bay. See the manual that came
with it for additional installation instructions.
On each interior side of the external drive bay, there is a plastic
guide with four support grooves, as shown below. When you
install a drive, you decide which grooves to use depending on
the size of your drive and where you want it to be. The
third-height diskette drive that comes with your computer is
already installed in the grooves at the top of the bay.
third-height drive
upper half-height drive
full.-height drive
half-height drive
Note
The external drive bay is designed for drives that are 5
inches wide. If you are installing a drive that is 3 inches
wide, it must have a mounting frame (or frames) installed on
it. If necessary, follow the instructions included with the
drive to install the frame(s).
4-6 Installing and Removing Drives