USB Disk Security is the best free security software for USB protection.It prevents against various threats from USB storage devices.
It is light weight software and it is easily available in their official website and it is free of cost.It is very easy to download, install and use.
It is compatible with other anti virus softwares and doesn’t effects the system performance.It is compatible with almost all the windows operating system above windows XP.It has some interesting and very useful features - it provides protection against threats from USB drives, it has **USB drive control**.
If this function is enabled then no unauthorized user can connect USB drives to the system, to connect USB drives, a password is required which has been set by authorized user at the time of enabling this function, **USB Access control**, this feature protect unauthorized copying of files to USB drives.It has some other useful features like - disk cleanup, safe open of USB drives, and others.Overall it is very good free light weight software, one should try this.