The small partners of commonly used U disk may have noticed that many USB flash drives are written to support USB 3.0.
USB is an interface technology in the computer field. USB2.0 and USB3.0 are common. The maximum transmission speed of USB2.0 is 60 megabits/second, while the transmission speed of USB3.0 is 640 megabits/second. It is USB2. 10 times 0
The USB2.0 device only has four metal strips under the interface, and the USB3.0 device has five hidden contacts in addition to the four contacts. Only the internal five contacts are connected to the USB3. The .0 state, the system is compatible with 2.0 and 3.0 devices.
When we insert the USB flash drive, the first four external contacts are turned on. If the internal five contacts are not connected within a short period of time, the system becomes a USB 2.0 device after the identification is completed, so the U disk The transmission speed is reduced to 1/10 of the normal state.