USB 3.0 updates this standard and allows for simultaneous sending and receiving.Īnother difference between the different versions is the amount of power they can deliver. USB 2.0 ports are uni-directional, which means that it can only send or receive data, but never both. Here are the current USB port types that are currently in use and their transfer rate: Transfer rate definition: Transfer rate is the maximum rate in which the USB device is able to transfer data from one end to another. The main differences between the various USB versions are its transfer rate and the amount of power they can supply. USB has had multiple iterations since its inception in 1995.
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