USB Flash Drives are the most common and Cost effective way to transfer data or share files from one physical location to another. But do you know that USB Devices are the biggest medium to transfer virus, worms, Trojans and other infected files. According to Report at Trend Micro Inc virus attacks through USB flash drives had increased more than two folds in September 2008.Even my personal Computer got infected many times by infected USB and I think everyone had gone through the same experience at least once.