Epson EISA Desktop - Manual (Page 109)

Align the notched corners of the cable connector with the
notched comers of the drive socket, as shown below. Then
push in the connector.
3. Locate the cable for each drive installed in the internal drive
bay. If you removed the subassembly earlier, also reconnect
the drive cable(s) to the drive(s) in the external bay. See
page 6-9 for instructions on connecting a diskette drive
cable.
If you are installing your first hard disk drive, you just attached
the drive cable to your main system board; use the first
connector on that cable. If you are installing your second
drive, the cable is attached to your other drive; you use the
second connector on that cable.
Installing and Removing Drives
6-19