Lenovo 10KG Hardware Maintenance Manual page 106

2. Disconnect the external optical drive adapter from the USB connectors on the external optical drive
and the computer.
3. Remove the screw that secures the external optical drive box on the VESA mount bracket and then slide
the external optical drive box as shown to remove it from the VESA mount bracket.
Figure 20. Removing the external optical drive box
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ThinkCentre M600 Hardware Maintenance Manual