Does the hard drive have a bearing?
My hard drive is making a noise that sounds to me like a bearing about to fail. The noise will stop if I pat the bottom of the case--like burping a baby. I shut it down, bought a 500 GB external drive, backed up everything, and have heard the noise only once since--48+ hours ago. Can/Should I do anything about this now, or continue to back up and wait until something stops working permanently?