Normally new USB 3.0 is colored as blue; however, there are some USB ports that are USB 3.0 but in black. And the difference between the two is in the number of teeth it has.
USB 2.0 has 4 teeth:
USB 3.0 has 5 teeth:
Hope it helped!
USB 2.0 has 4 teeth:
USB 3.0 has 5 teeth:
Hope it helped!
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