Acer AT350 F1 - Manual (Page 52)

3 System upgrades 40
2.5-inch HDD bays
7 Install a hard disk with carrier into the optional hard disk drive bay
(refer to the procedures in "Installing a hard disk drive with
carrier" on page 36).
8 Plug the power and data cables of the carrier hard drives.
9 Re-install the side panel and close the bezel door.
10 Observe the post-installation instructions on page 27.