I have a secondary hard drive in my machine that I bought about a year ago. I'm pretty it's that one that's making the noise but it has that constant "mini machine gun" sound, where it always sounds like data is being read or transferred. It's really annoying and I'm trying to figure out how to get it to quiet down. It makes the noise ALL THE TIME, ON AND OFF. I'm running Win 7 just in case you needed that. Thanks everyone.