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We have really sophisticated, formal strategies for that purpose:

https://en.wikipedia.org/wiki/Error_detection_and_correction...

https://en.wikipedia.org/wiki/Error_correction_code

Yep, I worked in the disk drive industry over twenty years ago, and I was surprised to learn that a lot of what we read off the disk is actually wrong! If not for a lot of generous error correction they'd've been pretty unusable.

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