In the beginning, there was USB 1.1, with the "low speed" and "full speed" devices (at 1 Mbps and 12 Mbps, respectively). Then USB 2.0 came along with "high speed" devices that ran at 480 Mbps. Now the new USB 3.0 bus specification defines "SuperSpeed" devices that run at 5 Gbps (5,120 Mbps).
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