First, USB 3.0 and transfer encoding mode different from USB 2.0, USB 3.0 specification from understand that, USB 3.0 is used in 8b / 10b encoding:
USB 2.0 adopts 8b encoding and the maximum transmission rate is 480Mbps, then the theoretical transmission speed can reach 60MB / s; and USB 3.0 will encode 8bit data into 10bit when transmitting data, which contains 2bit control data (Control); When receiving data, it is a reverse process, 10bit data will be decoded into 8bit + Control information, then the theoretical transmission speed of 5Gbps is 500MB / s. Compared with USB 2.0, USB 3.0 theoretically increases data transmission speed by more than 8 times, rather than 10 times as claimed by the outside world.
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