HP ProDesk 600 G1 Maintenance And Service Manual page 74

You can also install a 2.5-inch hard drive into a 3.5-inch drive bay using an adapter bracket
similar to the example shown below.
64 Chapter 5 Removal and replacement procedures: Tower (TWR)
Slide the drive into the bay adapter bracket, ensuring the connector on the drive is fully
inserted into the connector on the adapter bracket.
Secure the drive to the bay adapter bracket by installing four black M3 adapter bracket
screws through the sides of the bracket into the drive.