Epson Endeavor 468C - Manual (Page 134)

2. Locate the hard disk drive ribbon cable that came with the
computer. It is a flat cable with three connectors: one on
each end and one in the middle, as shown below.
tab
vertical drive
horizontal drive
connector
connector
main system
board connector
3. Select the connector on the end of the longest part of the cable
(the main system board connector). Notice the small tab in
the middle of the cable connector, as shown in the
illustration above. Align the connector so that the tab aligns
with the notch, as shown below. (The option card connector
board and diskette drive ribbon cable are removed from the
illustration for clarity.)
notch
Installing and Removing Drives 5-31