usb3.0 is an upgraded version of usb2.0, so on the basis of usb2.0, usb3.0 is fully compatible with usb2.0. But the premise is that your computer motherboard must support usb3.0, and secondly, the device used by your computer supports usb3.0. For example, if you don't support usb3.0 in hardware, then you can't achieve full compatibility with usb3.0. .
In usb3.0, its structure is the same, the socket is the same as usb2.0, and usb3.0 only improves the data transmission speed. When your computer is only compatible with usb2.0, you can plug in usb3.0 u disk which is compatible with usb3.0, but the transmission speed of usb3.0 is not enhanced, and the transmission speed of usb2.0 is the same. Therefore, if you need usb3.0 to fully play its transmission speed, you must have the computer motherboard and u disk fully support usb3.0 to play the effect of usb3.0.
Speaking of usb3.0 can be fully compatible with usb2.0, I can understand that USB3.0 devices can be plugged into the 2.0 interface, but the transmission speed is 2.0. Of course, USB2.0 devices can be plugged into the 3.0 interface, but the transfer speed is still 2.0. Only the device that reaches USB3.0 is plugged into the 3.0 interface. In this case, the transmission speed is the propagation speed of usb3.0.
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