USB3.0 and USB2.0 appearance difference, observe the USB (itself) jack and USB jack on the computer, the middle of the plastic sheet color: USB3.0 - blue; USB2.0 -- black. when
However, some devices color distinction is not standardized, such as some master chip support for non-native usb3.0 may not be blue, some usb2.0 devices such as MP3, data cable, etc., may be black
Or white plastic sheet.
1 red power supply positive, 2 white data -, 3 green data, 4 black power supply negative.