Show/Hide Icons in Ubuntu Desktop

Show the Computer, Home, and Trash desktop icons in GNOME

Open the Configuration Editor, by running the program gconf-editor (use terminal or Alt+F2)

Choose apps->nautilus->desktop.

Tick the box beside computer_icon_visible, home_icon_visible, and trash_icon_visible. The changes take effect immediately.

To Hide ONLY the Internal Parttions from the Desktop (not other Mounted Volumes):

Anything mounted in /media will show up on your desktop, provided that > Apps > Nautilus > Desktop > volume_visible key in gconf-editor is ticked.

So you have 2 solutions:
1. untick the key, but other mounted volumes (like CDroms, DVD, usb drives and such) will no longer show up on your desktop
2. mount your drive in another file than /media, in /mnt for ex