I give a USB flash drive to a friend. He returns it. I don't have a particular reason to suspect my friend of any wrongdoing, but I suspect his computer might be infected. I don't need to browse the flash drive - just make it safe to use again. My thinking is to disconnect all drives, boot DBAN from CD/DVD, insert the flash drive in question, wipe it and then it should be relatively safe to use again.
Any problems that I'm not seeing here?
Do I need to disconnect all drives if they are encrypted - i.e. if there is a payload on the USB drive where would it save itself if they disks are encrypted?