Epson Endeavor - Manual (Page 93)

Installing the Drive
Follow these steps to install the drive in a horizontal drive bay:
1. Locate the two metal guiderails and six screws that came with
the computer.
2. Using the appropriate screw holes, attach one guiderail to
each side of the drive (or each mounting frame, if attached),
as shown below. The bracket on the guiderail should be on
the opposite side of the connector end of the drive.
mounting frames
3-20 Installing and Removing Drives