Figure 53. Removing the optical drive
Step 3.  (Optional) Remove the optical drive retainer. 
a. 
Pull out the retainer to disengage it from the optical drive.
b. 
Slide the retainer downward, and remove it from the optical drive. 
Figure 54. Removing optical drive retainer
Step 4.  (Optional) Pull the optical drive bezel away to remove it from the optical drive. 
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ThinkSystem ST50 V2 Setup Guide