Format your pendrive by autorun.inf

If there is big virus in pen drive in that case pen drive is not format

• 1. Right click on my computer

• 2 Then click on manage

• 3 Disk Management

Here u see all u drives . right click on pen dirve an format

OR

To prevent a pendrive from infecting trojans or some kind of virus which uses autorun.inf file to execute, just create a blank folder in your pendrive and name it as autorun.inf make it hidden and read only. This trick is sometimes helpful to prevent those kind of viruses or trojans.