Epson 3865X Plus - Manual (Page 233)

Replacing the Drive on the Subassembly
This section describes how to reinstall your hard disk drive in
the vertical mounting position. The following illustrations show
the subassembly installed inside the computer with the front
panel attached. However, you can install the drive the same
way, whether the subassembly is installed already or not. Follow
these steps:
1. Pick up the hard disk drive and hold it above the right side
of the subassembly with the mounting plate facing the
subassembly, as shown below.
Notice that there are two tabs facing downward on the
bottom of the mounting plate. These tabs fit into two slots
in the right side of the subassembly when you install the
drive.
B-42
Installing and Removing Disk Drives