Win7U disk exits the next insertion, there is no way to identify

1, the U disk can not be used for details:
her U disk found that the computer exited, plugged in the U disk again, found that Windows 7 can not recognize the U disk. You must restart your computer to recognize it again. What is the problem? Let's solve this problem.
2. This problem occurs because your U disk is pulled out, but the computer still occupies the process of the U disk. At this time, you only need to manually end the U disk process.
You can end the function of the USB flash drive in the device manager.
3. Right click on the Windows 7 desktop mouse and click on "Computer”, select “Properties”. Click on the "Device Manager" in the top left corner, and then pop up "Device Manager" window, click to expand "Universal Serial Bus Control", there are many rows of "USB Root Hub" device list, I am here There are as many as eight. Right-click each "USB Root Hub", select “Disable” menu, then “Enable”. Figure: