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Open for suggestions for a fingerprinting tool. I think that's what they are called.

We are copying NASA imagery to make available to the public. They send us a hard drive with about 10,000 images and we copy them to a drive then return the original.

I'd like a tool that would compare the 2 drives to make sure everything was copied correctly. Then something that would be able to tell if some file had degraded, went missing or been changed over time.

Thanks,
David Bigwood
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Lunar and Planetary Institute