Can't copy the files on the USB flash drive.

When you copy something with a U-disk, the computer always restarts, but unplug it is OK, with antivirus software antivirus also no virus, redo system also useless, what is the problem?

This problem is very rare, but first of all to confirm that there is no virus or Trojan horse, antivirus software may not check out, so it is recommended that you format the USB drive, formatting attention to choose fat instead of FAT32, format and then see if restart. If there is a problem with the motherboard's USB controller driver, it is recommended to reinstall the motherboard's USB2.0 driver if it is restarted. If the driver after the update does not help, it is recommended to try using another USB stick will not appear the same situation. If the disk is damaged, it is possible to copy the file at the time of the current surge, the motherboard's USB protection circuit is not complete will directly lead to restart, but not every motherboard will appear this situation, if the other USB stick on your machine can be used normally can be determined that the USB flash drive has failed.