No matter how careful a computer user is, disasters are bound to happen during manual transfer and opening of documents. This disaster refers to files attacked by malwares lurking in flash disks and hard drives.  A desktop or laptop computer can easily be infected by different virus, worms, and other forms of malware.  The severity of infection can easily be observed in removable drives, like external hard disk and flash drives, when your files become suddenly missing. Local hard drives are affected also, as evidenced by a computer serving as conduit or host to spread the malware in removable drives.