Epson Endeavor - Manual (Page 90)

If you removed one hard disk drive and are leaving another
one in the computer, you need to set the jumpers on the
remaining drive to indicate that you now have only one hard
disk drive. For the correct settings, see the documentation that
came with the drive.
installing a Drive in a Horizontal Bay
This section describes how to install a drive in a horizontal
drive bay. Although the illustrations show a diskette or hard
disk drive in the lower bay, you can use these same instructions
to install a diskette drive in the upper bay.
Here you’ll find steps for the following procedures:
Attaching the mounting frames to a hard disk drive (if
necessary)
Installing the drive
Connecting the cables.
If you are installing your computer’s first hard disk drive,
it is best to install it in the vertical drive bay as described on
page 3-5.
Note
Before you install a hard disk drive, be sure to check the
jumpers on the drive. For instructions, see page 3-4.
Installing and Removing Drives
3-17