1. Color differentiation method: Computers can be distinguished according to the color of the socket. The black one is USB2.0, and the blue one is USB3.0 (usually located behind the host, because USB3.0 needs to be installed drive).

2. Differentiation by contact method: USB 2.0 only has 4-pin metal contacts, while USB 3.0 has 9-pin contacts. The front 4 pins are consistent with USB 2.0, and the rear 5 pins are exclusive to USB 3.0.

3. Identification method: distinguish according to the symbols next to the socket, as shown below. The "SS" of USB3.0 stands for "SuperSpeed"