I am really not sure what sound it is that I am hearing. It just started yesterday, but it sounds like my HDD spinning down. I don't think it is my CDrom drives as there are no cd's in them. Thing is I never hear it spin up, just a sorta high pitched sound of something spinning down. If it is my HDD, could this be a sing that my drive is failing? I have never heard my HDD ever before. But the sound that I am hearing is very similar to the sound of a CD-rom spinning down. I haven't made any changes that I can think of that would cause my HDD to need to spin down. Any thoughts? Is there any HW tests that can be run to see if my drive might be failing? I have that S.M.A.R.T. thing but it always says everything if OK, but not sure I trust that. If anyone thinks that it might be my drive starting a downward slide to oblivion, what is the best way to back up the whole drive? I have 3 partitions and if the drive is failing, then I would want a backup that I could copy onto another drive and basically dup the drive so the new one is the same as my current.