M1210 Hard drive buzzing

Hi all,

I've been using my M1210 for about 2 months now. Great machine, but one complaint. The hard drive makes a constant buzzing noise. As in other posts, I get the occasional click and clunk, but the buzzing noise seems to be when the machine is idle. It tends to go away if I'm doing something. For instance if I use my mouse wheel to scroll this forum window up and down rapidly, no buzzing, but once I stop scrolling, there's the buzz again. Any ideas? Perhaps I am wrong in my assumption that it's the hard drive, but what else could it be?

 

This wouldn't be a big deal, but my desk is in my room, next to my bed, and I often leave the laptop running downloads overnight (who doesn't?).