Remove shortcut to drives on Unity taskbar

Only one command is needed to remove al shortcuts to mounted drives on the unity taskbar:

In a terminal type:

gconftool --set /apps/compiz-1/plugins/unityshell/screen0/options/devices_option --type=int 0

and log in again

To get them back use:

gconftool --set /apps/compiz-1/plugins/unityshell/screen0/options/devices_option --type=int 1

Drives that are mounted after you logged in, wil appear on the unity bar though.