I'm thinking about getting a new HDD in the future, probably a WD after a friend told me how good his WD Black was but since then I've realised that the loudest thing in my PC is a 7200RPM drive. IDEALLY I'd want to go quieter than this (it's pretty much just a hum), but I'm not sure if a Black drive will be quieter. Has anyone got any experience comparing Black, Blue and Green drives in terms of noise and/or speed? Also if 2.5'' drives are louder, because they could be a better option if I get a new case and end up removing the 3.5" bays at some point.