To furthur what martinfocazio said. If you do manage to find someone who will allow you to plug your USB drive into their computer then thats not a computer I would be comfortable plugging in to anyway. Most companies have policies against it and have implemented some form of security to prevent the ports from working. The ones that do allow it there is no telling what those might be infected with. At very least make sure the drive your has some form of write protection but even then there is no telling what kind of keyloggers or other data miners may be on that computer.
I downsized from a 12" laptop to a 9" netbook for this very reason, there is no way I'm going t plug a drive full of my data into some unknown system, with most of the world running Microsoft windows there is just too much risk.