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That doesn't fix the issue though. The issue is a killer USB or a virus on the disk. Being able to only read an infected file still allows it to be read.

Also, this is only a software solution as the USB protocol would require bidirectional transmission.

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It doesn't fix the issue vs paper.

But it would bring us back to being as safe as a CD or diskette was.

I was thinking a special chip, talking bidirectionally both ways, pretending to be a PC host to the USB drive, and pretending to a DVD-ROM to the actual PC.

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