Have you ever noticed your hard drive churning away and wondered what it was
doing? Every now and then my hard drive takes off and starts whirring. I used
to go look at Task Manager to try to see what was going on but that wasn't
always obvious. There are also various other ways to check what is causing
the activity. However, none make it as simple as this free utility. Try it
and the mysterious churnings of the hard drive won't be so mysterious
anymore.
http://www.techsupportalert.com/content/use-nifty-utility-find-out-what-accessing-your-hard-drive.htm