I was wondering if someone can help explain the following to me. Looking at my late-2012 iMac (21.5" quad-core i7) System Information, the hardware lists 4 USB ports in the following order: USB 3.0 Hi-Speed Bus USB 3.0 SuperSpeed Bus USB Hi-Speed Bus USB Hi-Speed Bus My first question is, does the hardware system info above imply that I have two USB 3.0 ports and the other two are older USB 2.0 ports? I wasn't aware that Apple mixed and matched USB ports. And what is the difference between a USB 3.0 Hi-Speed Bus and a USB 3.0 SuperSpeed Bus? Is one better than the other? Just some USB questions that I never really paid attention to before. Maybe it might make a difference if I knew which is the best iMac USB ports to plug in something (like charging my iPod Touch or iPad or synching via USB).