Someone out there must know the answer – when hard drives are idle, what are all the noises they are making for? I have a couple of older WD Blacks (AAKS drives) that will start making clicks around four to five seconds apart when they are not doing anything and aren’t being accessed. I have a newer WD Green that I think does the same, just on a much quieter level. What are these clicks and noises for? Does it have to do with wear leveling?