What is the usb drive?

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USB drive with non-rewritable (or at least cryptographically-signed) firmware and a physical write-protect switch

what is the usb drive?i have not seen the usb drive. where can I get it?

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kanguru make an unencrypted usb drive with signed firmware and a
write-protect switch.
Other encrypted drives like the Kingston IronKey range would fit.
Flexxon make a Write once stick.

It’s just a search away.

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