i'll give it a shot for you.
what it looks like is the other hd is mounted through your /home. sometimes this can cause problems with apps. they think that your /120 is in your actual /home. thus your 120 is bigger than your /home and it is full. does that make sense?
remedy. change your fstab to mount that disk as it's own name. that is /120 instead of /home/120. to do this, su, passwd, cd, mkdir /120, vim /etc/fstab, and change where it's mounted, chown -R patske
atske /120. give it a reboot, since, i'm not positive on this, debian doesn't have an update-fstab. actally i don't think that any of them do.
then i would update your app to burn/rip to that partition, hd, and you should be set.
cheers.