Dell Inspiron 13z (N311z, Mid 2011) - Manual (Page 22)

22 Hard-Drive Assembly
5 To avoid damage to the hard drive, gently slide the hard-drive bracket
away from the hard-drive slot.
6 Lift the hard-drive assembly off the computer base.
7 Remove the two screws that secure the hard-drive bracket to the
hard drive.
8 Lift the hard drive out of the hard-drive bracket.
1 screw 2 hard-drive assembly
1
2