Dell Inspiron 3521 Owner's Manual page 20

3 Remove the screws that secure the optical-drive bracket to
the optical-drive assembly.
4 Remove the optical-drive bracket from the optical-drive assembly.
5 Carefully pry the optical-drive bezel and remove it from the optical-drive assembly.
1
1 optical-drive bezel
3 screws (2)
20
| Removing the Optical-Drive Assembly
2
4
2 optical drive
4 optical-drive bracket
3