As we unlatch the tray lid on the right side of the unit, the lid swings down and away as we pull the mounting tray for the 2.5" SATA hard drive out of the Xena unit. Taped inside of the tray are the 4 screws for mounting the hard drive to the tray.

The tray is completely removeable from the Xena unit for easy hard drive installation. You can see the access panel lid swung down and away with the locking mechansim.

If you have a 2.5" SATA hard drive for this purpose, this is what it would look like after installation into the tray.