Try the following:
1. Format it in \"Computer Management\". Right click \"My Computer\
2, use USBoot and similar software repair.
3, to the U disk home download the corresponding U disk repair tool, repair.
4, the above method is ineffective, the amount of production tools mass production U disk. Mass production of U disk is very troublesome, and one is not necessarily successful, often to many times to succeed. First of all, use ChipGenius (chip wizard) to view the U disk main control model, you can also open the U disk shell to view the U disk chip model, sometimes the detection software detection is not correct, direct view is more accurate; Then according to the master model, download the corresponding mass production tool, not necessarily the latest mass production tool, install the mass production tool; Run mass production software, mass production of U disk. Mass production tools are the ultimate weapon for maintenance of U disk, as long as it is not a hardware failure, the amount of production tools can be almost 100% repaired, but mass production often takes many tests to succeed, you can change several mass production tools, you must first go to the online tutorial.