HP Armada 7300 Installation And Operation Manual page 97

5. Align the front cover of the half-height drive with the front
edge of the tab on the inside edge of the drive cage.
Aligning the Half-Height Drive with the Drive Cage
6. Tighten the four screws that secure the drive cage to the half-
height drive.
10-10 Installing and Removing a Half-Height Bay Device