What can I do if the U disk is not recognized on Win7

        The first time you insert the USB flash drive into the computer, the system recognizes it normally, and then inserts it and then finds that the system cannot recognize the USB flash drive. In this case, the system home recommends that you disable the USBRootHub device and re-enable it.

Computer icon, right-click "Properties" on the desktop command

out of the window, click the Device Manager tab

in the Device Manager window, double-click to expand " universal serial bus controllers "

carry out more projects, right click USBRootHub device, click" disable "

disable the device will pop up to stop the run dialog box, click "Yes,"

will find that there is a down arrow icon on USBRootHub equipment, this is the device is in a disabled state

then "enable" in the right-USBRootHub device, click, so Can solve the problem that can not be recognized after USB plugging