HP DL120 - Manual (Page 38)

Removal and replacement procedures 38
c. Push the HDD 1 carrier towards the front of the chassis, and then slide it out completely (3).
d. Remove the four mounting screws that secure the HDD 1 module to its carrier (4).
Reuse these screws when you install the new hard drive.
e. Remove the HDD 1 module from its carrier (5).
f. Place the old hard drive on a static-dissipating work surface or inside an anti-static bag.
g. Proceed to step 5 for instructions on how to install the new hard drive module.