USB connector2.0 and USB connector 3.0 are interoperable.
The performance of the USB2.0 device will not be affected when it is connected to the usb3.0 interface.
The performance of USB3.0 devices will be reduced to the performance of USB2.0 when connected to USB2.0.
The theoretical speed of USB 2.0 is 480Mbps=60MB/s. The theoretical speed of USB 3.0 is 4.8Gbps=600MB/S, but the actual transmission speed of the two is far from the theoretical speed, which is limited by the hardware bottleneck of the motherboard hard disk.