Epson Endeavor - Manual (Page 81)

Installing the Hard Disk
To install the hard disk drive, you first need to attach it to the
mounting plate in the vertical drive bay. Follow these steps:
1. Remove the screw securing the mounting plate to the
horizontal drive bays and set it aside. Then slide the
mounting plate in the direction of the arrow, and lift it out.
3-8 Installing and Removing Drives