Start an Admin session on the machine.
Click the Start button and select Run. Enter "gpedit.msc".
Under "User Configuration\Administrative Templates\All Settings" look for a setting named "Prevent access to drives from My Computer" and double-click on it.
Select "Enabled" and "Restrict all drives", and click OK.
If you would like to also hide these drives, you may repeat the same step for a setting named "Hide these specified drives in My Computer".
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