HP 520 Maintenance And Service Manual page 41

Remove the hard drive (3) from the hard drive bay.
5.
If it is necessary to replace the hard drive bracket, remove the four Phillips PM3.0×3.0 hard drive
6.
bracket screws (1) from each side of the hard drive.
Lift the bracket (2) straight up to remove it from the hard drive.
7.
Reverse this procedure to reassemble and install the hard drive.
Component replacement procedures 33