Ratool (Removable Access Tool) is a simple-to-use portable application that helps an individual or a system administrator control USB storage devices from being copied by others.

Ratool can disable USB storage access or enable write protection on all USB Flash drives, thus prevent data from being modified or deleted.

There are a lot of such tools available on the internet, but they are not sufficient; for example, if you use a USB disabler and disable any USB storage/pen drive you can use another tool and enable it again easily, meaning; they do not protect your USB ports. If you use Ratool, you don't have to worry about such a situation because other tools can not easily break Ratool's protection.

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Version History for Ratool (Removable Access Tool):
http://www.sordum.org/8104/ratool-v1-3-removable-access-tool/