To modify the visibility of a volume:
Select the volume in the local menu, then click the Show button (to make it visible) or the Hide button (to make it invisible).
You can use the Visibility pane to act on the visibility state of a volume, folder, or file.
Select the volume in the local menu, then click the Show button (to make it visible) or the Hide button (to make it invisible).
Click the Show Folder button to make it visible or Hide Folder to make it invisible, then in the dialog that appears, select the folder.
Note: These two buttons can possibly influence the visibility of a volume.
Click the Show File button to make it visible or Hide File to make it invisible, then in the dialog that appears, select the file.
Warning: All of these operations reopen the Finder. Verify that no operation is in progress (copying, moving, burning, and emptying the Trash).