The ports now showing up in IORegistryExplorer are only the physical ports that work on my computer. I have 14 physical USB ports (6 USB2 (4 of which are internal) and 8 USB3 ports). However, as you pointed out in your guide, the USB3 ports have both HSxx and SSxx assignments. This means that there are 14 HSxx assignments and 8 SSxx assignments. I guess my question is, do the physical ports with both HSxx and SSxx assignments count as one each or two towards the port limit? If two, then I am over the 15 port limit, and I assume, to get under the limit, I would have to exclude some of my working USB ports. Please let me know if my understanding is correct or flawed. Thanks!