USB disk virus, is the virus that automatically play the disk, we also call it AUTORUN virus.

Its biggest feature is that when removable disk access computer (U disk, mobile hard drive, SD card, and other storage devices), the virus will infect the computer, when the user double-clicks any icon on the infected computer, it will run the virus files automatically, or it will directly cause the system re-infected virus. Some users reflect that, after infect the computer with virus; the virus still exists reinstalling the system, basically caused by the USB disk virus. USB virus has two parts, one is the virus file, and another one is autorun.inf file.

1) How USB get infected with virus?

There are about three kind of way computer get infected with USB virus. Here, I will introduce one of the methods; it is the most important mode of virus transmission- transmission via mobile disk.
Windows automatically playback:

This feature is in default, is enabled, the performance of the removable disk into your computer will automatically open the removable disk. USB disk virus is to use this function to implement their own transmission.

2), USB virus infection process

When a removable disk is inserted into a computer which was infected with virus, the virus process will full scan and copy the files to the root directory of the USB disk drive, and generate a file called autorun.inf. The function of the file is when the user double-clicks the root directory of the drive containing the file; it will run the virus file. If the files virus turns up a problem during operation, the drive will not open. When the removable disk is inserted into a non-infected machine, due to the presence of auto-play feature, this removable disk will be automatically open, and run the virus file. Then the process of virus transmission from USB disk drive to computer is complete.

3), manual way to protect

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