the USB 3.0 B-connectors will not mate with USB 1.1/2.0 B-sockets In order to do all of this as cheap as possible without breaking backwards compatibility – they had to introduce a new row of conductors buried inside the A connector and straddling on the side of the various types of B connectors creating cable-compatibility issues – i.e.
USB 3.0 ups the physical layer rate from the 480Mbit/s to a more reasonable 5Gbit/s – and is on its way to 10Gbit/s, while alleviating shortcomings in power delivery by upping the current limit from 0.5A to 0.9A without the battery charging/supercharging extension.
Compared to USB 2.0, USB 3.0 is a miracle long overdue.
