1. USB devices can consume up to 500 milliamperes (mA) for each connection. If a device attempts to draw more current than this, the operating specification invokes the appropriate function to disable that particular port until the system is powered off and on again (this is called a "suspend" port). Also, if the device consumes less than 50 mA, the port does not activate; 2. There is often this situation: when a damaged piece of hardware is plugged into the serial bus, it will cause the system to stop responding (hang). In most of these cases, a bus reset occurs. Warm-starting the computer does not resolve this issue; The bus must be reset by powering the system off and then back on. It can be more difficult to identify damaged hardware devices; 3. Check the "Power" tab in the properties of "USBRootHub" to check the power consumption of the USB bus; 4. Whether the U disk can be used normally on other machines, if so, there is a problem with the USB interface of the motherboard. If the USB flash drive is still not usable on other machines, the USB flash drive is damaged.
