Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
You could open it up and tighten everything down to see if that helps (as the drive is shock mounted within the bay, so if not fully tight it could cause a vibration to be more noticeable.

That's a good point, I'll have to try that.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.