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USB Flash Security is a lightweight security application that allows to password protect USB drives and deny any unauthorized use or virus infection when transferring data from computer to computer. Its interface is simple and lists all connected USB devices so you can choose drives to set passwords to. The password has a strong encryption algorithm that becomes automatically locked every time you remove the drive. Note that the program wipes off all data during installation and uninstallation so you need to back up all your data to local drives before password is installed. The freeware version supports only USB up to 4GB in size.
