Every few days my iMac starts some sort of background disk activity. The disk clicking is continual, and is enough to make the cursor movement very jerky. I have gone so far as to quit every background process (using AppWatcher), but that doesn't stop it. I have also scanned for viruses, but found none. I usually just restart, and then I'm OK for a few days. It's also not Sherlock indexing. Any suggestions?
I would switch to OS X if there were any drivers for my hardware...