HP Compaq Elite 8300 Series Reference Manual page 170

9. Slide the cover on the carrier (1) and replace the screw on the rear of the carrier to secure the
cover in place (2).
Figure B-8
10. Slide the hard drive carrier into the enclosure on the computer and lock it with the key provided.
NOTE:
162 Appendix B Removing and Replacing a Removable 3.5-inch SATA Hard Drive
Replacing the Carrier Cover
The carrier must be locked for power to be supplied to the hard drive.