Remove icons of mounted drives
 

Hi!
In ubuntu 12.04b2 in the Unity bar there are the icons of mounted drives. I would like to hide them!
According to some websites, I shall install gconf-editor by typing: "apt-get install gconf-editor"
I did this, It's been installed.
These websites say, that I should go to Apps/Nautilus/Desktop.
But in apps/nautilus I only have preferences..
What should I do now?

Press Alt-F2, type gconf-editor, press run. you'll see folder tree, navigate to Apps/Nautilus/Desktop

As I said:
In apps/nautilus/ there is just a folder "preferences" and nothing else!