Lenovo ThinkCentre M72e User Manual page 56

This section provides instructions on how to install or replace the optical drive.
Note: The optical drive is only available in some models.
To replace the optical drive, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See "Removing the computer cover" on page 32.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 32.
4. Pivot the drive bay assembly upward. See "Accessing the system board components and drives"
on page 34.
5. Disconnect the signal cable and the power cable from the optical drive.
6. Hold the optical drive and remove the two screws that secure the optical drive.
Figure 26. Removing the optical drive screws
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ThinkCentre User Guide