Dell XPS 730 (Late 2008) - Manual (Page 59)

Replacing Drives 57
See the documentation that came with the drive for instructions on
installing any software required for drive operation.
13 Enter system setup (see "System Setup" on page 97), and select the
appropriate Diskette Drive option.
Replacing an Optical Drive
1 Follow the procedures in "Before You Begin" on page 13.
2 Remove the computer cover (see "Replacing the Computer Cover" on
page 17).
3 Remove the drive panel (see "Replacing the Drive Panel" on page 51).
4 Disconnect the power and data cables from the back of the drive.
NOTE: If you are uninstalling your only optical drive and will not replace it at
this time, disconnect the data cable from the system board and set it aside.