How do I tell what process is hogging the disk?

[Pierre Abbat <phma@xxxxxxxxxxxxx>]

Something just rattled the disk for several minutes in a row. I don't know 
what it was. I have some cron jobs, but those don't take more than a few 
seconds, except the nightly hammer run, and I know when that is. I ended up 
killing the process taking up the most memory, which turned out to be a 
Konqueror window where I was shopping for some solar stuff. I tried with top 
and systat to figure out the culprit, but did not succeed.

Pierre
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