Let Win7's USB device disappear all the time.

In Windows 7, run the Registry Editor, expand to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesUSBSTOR, find it in the right window and double-click "Start", and then in the pop-up window, change its default value to “4”.

Top: Change the Start value to 4
After the modification is completed, save the settings to exit, and the next time you restart, it will take effect.
After using this method, the USB device in Windows 7 will be disabled. If the user needs to enable the USB device, you must enter the above key values ​​again and change the value back to “3”
Editor's Comments:
Compared to the way to improve the control permissions of Windows7, the effect of the method described in this article is very "completely", but every time you need to modify the registry, this is a very troublesome thing. . Therefore, we do not recommend using this method.