Epson 3865X Plus User Manual page 198

If you'll be using two hard disk drives, you have a total of four
jumpers for eight jumper positions. Two jumpers are included
with each drive. Install three of the jumpers on the master drive
in positions C/D, DSP, and ACT. Install the fourth jumper on
the slave drive in position ACT.
If you are installing both of your hard disk drives at one time,
you should install the drive in the horizontal drive bay first. See
"Installing or Removing a Disk Drive in the Horizontal
Position," on page B-27, for instructions.
If one of your hard disk drives is already installed in the
computer, follow the steps under "Removing a Hard Disk From
the Vertical Position," on page B-24, to remove the drive. Then
set the jumpers on both drives while they are out of the
computer. The steps in that section tell you which instructions
to follow next.
If you are removing one hard disk drive and leaving one in
your computer, be sure to set the jumpers on the remaining
drive to indicate that you have only one hard disk drive
installed. See the table
follow the instructions
the Vertical Position," on page B-24, so you can access the
jumpers on the drive.
for the j
Installing and Removing Disk Drives
B-7