Solve the problem that Win7 can't be used after exiting U disk

Children’s shoes said that after her U disk found that the computer had quit, she inserted the USB flash drive again and found that Windows 7 could not recognize the USB flash drive. You must restart your computer to recognize it again. What is the matter? Here's how to solve this problem:

Right-click on the Windows 7 desktop mouse and click on "Computer" and select "Properties". Click on "Device Manager" in the upper left corner, then pop up the "Device Manager" window, click to expand "Universal Serial Bus Control", there are many lists of "USB Root Hub" devices, I have as many as eight here. Right-click each "USB Root Hub", select the "Disable" menu, and then "Enable".

Every "USB Root Hub" can do this, Windows 7 can recognize the U disk again without restarting.