Acer Predator Orion 3000 Desktop Gaming Computer - Manual (Page 11)

UPGRADING YOUR COMPUTER - 7
Installing the 3.5-inch hard drives
1.
Remove the new hard drive from their
packaging.
2. Place the hard drive into the carrier (1) and
reinsert the retaining screws into the hard
drive (2).
3.
Insert the hard drives into the hard disk cage.