App Tyrant

In addition to files and folders, with Desktop Ghost Pro 2.1, you can now hide external disks, connected servers, and removable media from appearing on your desktop to stay spotless and distraction-free.

Release Notes:

Desktop Ghost Pro can now hide mounted volumes (external disks, hard disks, connected servers, and/or removable media) from appearing on the desktop! For this feature to work you must grant Desktop Ghost Pro permission to send Apple events when prompted.