Thumbscrew
Protect your USB from being infected where you use it.
USB sticks are especially dangerous when using them on public PCs, at high risk of acquiring a virus. So that you don't take them with you, and infect your home or work PC via your USB, you should ideally carry in it a protection tool like the one offered here to download, Thumbscrew.
Thumbscrew is a handy free application, ready to be run directly from a USB, so that you can copy and run Thumbscrew directly from the USB, and protect it against writing any type of malicious software. The Thumbscrew operation is very simple, when you click on its executable you write-protect your pendrive, and if you click again it will allow writing. Furthermore, the protection status will appear in the system tray, next to the Windows clock.
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