HP EliteDesk 800 G3 SFF Hardware Reference Manual page 34

Installing a 3.5-inch hard drive
NOTE: There are two 3.5-inch hard drive bays. The procedure for installing a 3.5-inch hard drive is the same
for each drive bay.
1. Remove/disengage any security devices that prohibit opening the computer.
2. Remove all removable media, such as compact discs or USB flash drives, from the computer.
3. Turn off the computer properly through the operating system, and turn off any external devices.
4. Disconnect the power cord from the AC outlet and disconnect any external devices.
IMPORTANT:
as the system is plugged into an active AC outlet. To prevent damage to internal components, you must
disconnect the power cord from the power source before opening the computer.
5. If the computer is on a stand, remove the computer from the stand.
6. Remove the computer access panel.
7. Install mounting screws on the sides of the hard drive using standard 6-32 silver-and-blue mounting
screws.
NOTE:
new hard drive.
If you are adding a second 3.5-inch hard drive, you can purchase extra mounting screws from HP.
Install four silver-and-blue 6-32 mounting screws (two on each side of the drive).
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You can also install a 2.5-inch hard drive into a 3.5-inch drive bay using an adapter bracket similar
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to the example shown below.
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28 Chapter 2 Hardware upgrades
Regardless of the power-on state, voltage is always present on the system board as long
If replacing a 3.5-inch hard drive, transfer the mounting screws from the old hard drive to the
Slide the 2.5-inch drive into the 3.5-inch adapter bracket.