I have a 80GB Maxtor 5400RPM drive that started getting noisy over the past week or so. It's been getting progressively worse ever since then.
The last time I turned my computer off for 48 hours and turned it back on it was REALLY nosiy, but it got quieter the longer it had been on.
Right now it's in a mobile rack. The rack has a total of 2 fans and the drive doesn't appear to be getting too hot.
I sent a drive back about this time last year because of the same problem and Maxtor replaced it with the drive I have now. The only problem is now Maxtor won't take RMA's on any drive that doesn't fail their software exam and generate a code.

I figure in due time it will keep getting worse and eventually give up the ghost. Any ideas as to what might cause it to be noisy? Bearings going out?
It doesn't have any real vital data on it, but I'd prefer not to lose anything if I didn't have to. It's mostly just windows all my programs and downloaded files. All of the stuff I just can't bare to live without is on a seperate RAID array.