The primary difference between each version is data transfer rates. USB 1.1 could operate at 12 Mbit/s and 1.5 Mbits/s. USB 2.0 can operate at 480 Mbit/s in addition to the slower speeds. USB 3.0 is backward compatible and can operate up to 4.8 Gbps. USB 3.0 also carries four additional wires than previous versions for bidirectional data transfers.
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