USB means "Universal Serial Bus". This is a new interface technology that has been widely used in the PC field in recent years. The USB interface has the characteristics of faster transmission speed, support for hot swapping and connection of multiple devices. It has been widely used in various external devices. There are currently three types of USB interfaces: USB1.1 and USB2.0, and USB3.0 which has appeared in recent years. Theoretically, the transmission speed of USB1.1 can reach 12Mbps / second, while USB2.0 can reach the speed of 480Mbps / second, and it is backward compatible with USB1.1.
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