Has anybody compared harding wiring the time capsule speed vs using a thunderbolt equiped ext hdd? I'm interested in knowing if a thunderbolt equiped ext hdd is faster than a time capusle hard wired to my imac? Also, does anybody know the speed of the 2tb tc? Is it 5400rpm or 7200rpm? Lastly, I saw the 3tb tc at an apple store and it described it as server grade hdd. Can someone explain to me what this actually means. Does this mean that it's more reliable? Considering that it's $200 more for one more TB, it seems like a lot of money to ask for.