Epson EQUITY 3865X/20 PLUS - Manual (Page 155)

3.
4.
Turn your hard disk drive so the components are facing up
and the connectors at the back of the drive are facing your
right.
Place the flat side of the mounting plate on the hard disk
drive, as shown below.
components
I
mounting
plate holes
sockets
Installing and Removing Disk Drives 7-11