The current $80 super drive that is out right now, it's only USB 2.0 correct, or did they upgrade it to the faster USB 3.0? I've never used any external USB DVD reader/burner before so I'm wondering if there's a difference in performance vs an inboard sata DVD reader/burner? Is it limited by the speed of the USB port or the read/write speed of the optical drive itself? Any gurus out there with an answer?