Lenovo ThinkCentre M53 Hardware Maintenance Manual page 126

3. Remove the screw that secures the optical drive box on the VESA mount bracket and then slide the
optical drive box as shown to remove it from the VESA mount bracket.
Figure 26. Removing the optical drive box
4. Slide the release button on the optical drive box and then remove the external hard disk drive adapter
from the optical drive box.
Figure 27. Removing the external hard disk drive adapter from the optical drive box
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ThinkCentre M53 Hardware Maintenance Manual