I've just bought a 500gb western digital elements external usb hard disc. And its sloooooooooooooooow. I've used all my IDE/SATA ports so USB is the only option left for more storage currently. My question is, if I'd bought a standard WD 7200rpm sata drive and then put it in a Sata enclosure, still connected over usb, then would I get performance similar to an internal drive?