Hi everyone. I want to buy or build my own external drive to use as the main drive of my imac 27. Im looking to build one that is very very silent. I was thinking of buying a WD Caviar Green (they say its a very silent drive) and an external case that powers by usb or firewire 800 and has no fans. Is the WD the quietest drive in the market right now? Is it really that quiet or does it make some noise? My other solution is to buy a SSD and an external case that powers by usb or firewire 800 too. Are there external cases that can be powered just by the firewire 800 instead of the usb? Any other ideas? How about buying a 32GB SSD and put it in an external case connected to the imac by usb and powered by usb and then a WD Caviar Green in another case connected by usb and powered by usb too? This way the OS would be in the SSD and all my music and videos and such would be on the WD. Is this a good way? Which drive is quieter? The SSD or the WD Caviar Green? Or are they basically the same and make no noise at all? Thanks!