How to Protect your USB Flash Drive from Viruses?
Use USB Immunizer (Free | Windows):
USB Immunizer is a free tool from Bitdefender to immunize your flash drive or SD card so no virus can infect your USB flash drive.
1. Launch USB Immunizer and let it detect your USB drive.
2. Click on the USB drive icon and let the Immunizer work.
3. Now your USB drive is immune and it won’t get infected with any virus.