If I plug in a USB 2.0 Storage Device into one of the 3.0 ports of my Windows 10 desktop, its descriptor says that it is plugged in to
Hub: 1 Port: 1
Every 2.0 device plugged into this same port will always get this same hub and port number.
However, plugging in a USB 3.0 device, the port numbers are always bigger than 10. So, a USB 3.0 device plugged into the same port will get
Hub: 1 Port: 16. This behavior is consistent through all of the USB 3.0 devices I've plugged in.
Why is there a difference in the port number designation of USB 2.0 and 3.0 devices? There is no difference when 2.0 and 3.0's are plugged into a USB 2.0 port.
One reason I thought of was that different controller settings / circuits are used in order to enable 3.0 functionality, and therefore a different port is assigned.