Which one of the USB ports supports USB 3.0?
How can I tell which port on my ThinkPad T420s is a USB 3.0?
Originally on earlier systems with USB 3.0 the ports are identified by the blue insert. See illustration below of a typical ThinkPad USB port configuration.
On later models the blue insert was replaced with a black insert and the following symbol to identify USB 3.0 ports;
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most still use the blue color as it is a de facto standard
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