HP ProDesk 400 G3 Small Form Factor Maintenance And Service Manual page 42

● If you are removing a 2.5-inch hard drive, remove the four screws that secure the drive to the drive
cage (1) to release the drive (2).
5. Install the new drive in the drive cage.
● If you are installing a 3.5-inch hard drive, slide the drive in the drive cage (1) and secure the drive
with four 6-32 standard screws (2).
NOTE:
cage.
34 Chapter 4 Removal and replacement procedures: Small Form Factor
The four screw holes for the 3.5-inch hard drive are stamped "A" on the top of the drive