As you know, almost virus, trojan, worms is spreaded from USB storage devices. This is including USB Flash drive, removable hard disk, Memory card, SD, MicroSD, MMC, USB Camera, USB Audio player, Mobile phone, iPod, Iphone etc.
Other antivirus software should update signature database regularly, and they can not effectively protect offline computer that is not connected to the Internet. When new viruses, worms and other malicious attacks strike, traditional signatures are insufficient.
Beside the common antivirus, there is another antivirus that is designed for USB Flash drive and other media based on USB. And its completely free, easy to use and small memory usage.
Naevius USB Antivirus gives you full freedom for securely using your removable usb drives!