Before the good, suddenly does not show, in someone else's computer on it, and roommate bought u, roommate in my computer can solve!!
To the device manager to see if there is no unknown device or yellow question mark, delete the restart after the computer, and then plug the U disk
Very simple, that is, when you U disk recognition error, this error can not be solved without loading the system, you must restore the system or reinstall
Is it the win7 system?. If so, uninstall the USB driver to the device management, then restart the computer and reinstall the drive. (it's recommended to plug in the U disk after networking.) A driver is not recognized, the words of win7 inserted people on the U disk will install the new driver, and you had installed, but due to some reasons lead to the identification but not re install the driver, it is recommended that you uninstall the USB driver. (several) USB, root, these are uninstalled. Just restart it. I also often have trouble identifying U disks, especially computers that plug into different brands of USB devices,. (it's recommended to plug in the U disk after networking.)
1, right desktop, this computer, management, disk manager.2, see where the USB partition is not found.3, shut down USB energy saving mode.1 click on the "right mouse button" property of the computer";2, double-click the device manager";3 double click "universal serial bus controller" --- "USB Root Hub", double-click any one;4, open the properties dialog box, and switch to the power management tab;USB Root Hub closed power-saving mode, then remove the "tick allow the computer to turn off this device to save power before; and then click" OK "to return, in turn each" USB Root Hub "properties are modified after the restart the computer.
