I have read that firewire or esata is faster than usb 2.0. I have a 2010 macbook pro with snowleopard on it & have a 7 port ac powered usb hub hooked up to it. If I plug in 1 or more external hard drives into the hub & have them working together/transferring files, will there be a big slowdown? right now my hard drives are in just usb 2.0 enclosures. Would it be worth upgrading their enclosures to firew wire - esata? would I feel a performance difference? the hard drives are sata & others are ide. can anybody suggest some good enclosures that will dissipate heat well? I sometimes run my hard drives for up to 2 hours at a time. one hard drive is for photo & video files, one is for my itunes & music & one would be for video editing.