How to fix the U disk drive in the system

How to fix the lack of U disk drive? If it is the reason of the system or the system's own driver, the specific repair method is as follows: 1. Press F8 to enter the safe mode and then exit, select restart or shut down at boot, you can enter the normal mode (fix the registry). 2. If the fault persists, please use the system restore that comes with the system to restore it to the time you did not have this fault (if the normal mode fails to recover, please press F8 to enter the safe mode and use the system restore). 3. If the fault persists, use the system disk repair, open a command prompt and enter SFC /SCANNOW Enter (there is a space between SFC and /), insert the original system disk repair system, the system will automatically compare and repair. 4. If the fault persists, set the CD-ROM drive in the BIOS to insert the system startup disk into the system installation disk and press R to select “fix installation” 5. If the fault persists, it is recommended to reinstall the operating system.