Lenovo ThinkStation E20 4215 User Manual page 30

Figure 14. Removing the optical drive
4. Install the optical drive retainer on the side of the new optical drive.
Figure 15. Installing the optical drive retainer
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User Guide
v If you are replacing an optical drive, disconnect the signal cable and the
power cable from the rear of the optical drive, press the blue release button,
and then slide the optical drive out of the front of the computer.