Description:
Removes the icons representing selected hard drives from My Computer and Windows Explorer. Also, the drive letters representing the selected drives do not appear in the standard Open dialog box.
To use this setting, select a drive or combination of drives in the drop-down list. To display all drives, disable this setting or select the "Do not restrict drives" option in the drop-down list.
Note
Also, this setting does not prevent users from using programs to access these drives or their contents. And, it does not prevent users from using the Disk Management snap-in to view and change drive characteristics.
Also, see the "Prevent access to drives from My Computer" setting.
Note