I first noticed somethign was wrogn when I heard disk access while I wasn't doing anything. I looked at gnome's system monitor the other day and saw a constant 40kb/s download while I wasn't doing anything. I thought this was odd, and then 5 min later saw I had no free disk space left. How can I track down where the disk I/O is occuring quickly so I can find the root of the problem?

My first thought is a torrent that somehow got left on but I've only used azureus in the past which requires explicit start/stop. Help! Other thought are maybe logging that's going on but I disabled everything in gnome's services.

hiya
type either: ksysguard "or" gksu ksysguard "to run as root"

to see what processes are running

presumably your running Ubuntu, correct

Are you sure it was/is a download? The last time I had something like this happen it was updatedb run amok.
ps -e to list current processes.

Try:
lsof
fuser -mv /

And see what is reading/writting on disk.

You can install iptraf to try to determine from/to where the traffic is comming/going.

Good luck!

[]´s, FMC!

What was happening, & how did you fix it?

Try to find what was downloaded.
Mybe look for the log files, if you are using ext3.