Epson Pollution Preventer User Manual page 87

If you are installing a 3.5-inch diskette drive with a header
connector, see page 4-13 for instructions on connecting the
cable.
3. Locate one of the power supply cables that lead from the
power supply. (They have multi-colored wires and a plastic
connector on the end.)
4. Align the notched corners of the power supply cable
connector with the notched corners of the drive's power
connector (such as the one shown below). Make sure the
holes lit over all the pins and then push in the connector.
Caution
If you do not align the connectors correctly, you could
severely damage your drive when you push them in.
4-20 Installing and Removing Drives
notched
corners