I am hoping to get a Mac Pro sometime this year (waiting to see if Apple updates the line). But I was wondering that since the machine has 4 HD bays does it get noisy? I used to get annoyed by the spinning and grinding noise of the hard disk in my iMac so I swapped it out for a much quieter and faster SSD. I know I can still put SSD's in the Mac Pro buying 4 of them would be a fortune right now. I'd start off with one as the primary drive then add more as time went on. I assume that drives 2-4 wouldn't spin up until something is accessed on those drives, therefore eliminating some of the HD noise? Anyone that has all 4 bays full of spinning HD's, how noisy is the machine?