I have two WD hard drives in my system and I think one of them has started to make a new noise. Sort of like a rattle now and then. No real clicking, almost sounds like resonance. Hard drive about to fail? Any way I can check the 'health' of the hard drive? What backup programs out there are good to make an exact backup of the hard drive that I can save to a few blank DVDs? I've heard of Norton Ghost but not much else.....appreciate any feedback.