>
> Filesystem Size Used Avail Use% Mounted on
> /dev/sda6 3.9G 133M 3.8G 4% /
> tmpfs 3.9G 0 3.9G 0% /dev/shm
> /dev/sda7 3.9G 133M 3.8G 4% /home
>
Well, that is not looking good. Was that booted from the rescue cd?
Sometimes when you boot from a different drive (such as CD) it can switch the devices around. Maybe they are on SDB?
What does "fdisk -l" show?