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How do I find out what is using up all the space on my / partition?

No Free disk space

so I have 2 hard drives in my server, one main one that is 10gb and then a separate one that is 2tb

I'm storing all the files on the second one and the df -h output looks like this

Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             9.2G  8.8G     0 100% /
tmpfs                 1.5G     0  1.5G   0% /lib/init/rw
udev                  1.5G  148K  1.5G   1% /dev
tmpfs                 1.5G     0  1.5G   0% /dev/shm
/dev/sda4             1.8T  747G  981G  44% /home
/dev/sda4             1.8T  747G  981G  44% /usr/lib/cgi-bin

I just can't figure out why the first one is full when all the files are being stored in the /usr/lib/cgi-bin

I'm running debian

I can't seem to find any files that would take up 8.8gb that arn't on the second hard drive :S

Thanks!