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This USB flash drive can only store 8KB of data, but will last you 200 years
(www.tomshardware.com)
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this post was submitted on 20 May 2024
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also QR codes have EXTREME data redundancy, you can cover like half of a QR code and it'll still work.
In our scenario we don't need much redundancy, since the paper will be in controlled conditions and shouldn't degrade, and we'll make damn sure to scan the entire thing without crap obscuring it.
We also don't need all the tracking features, all we need is a marking in one corner so we know what way to put it into the scanner.
All this taken together should result in a data density that is actually realistically useful with just one side of a single A4 sheet.
Imagine storing a digital photo on a piece of paper, and needing to scan it to reproduce the photo.. someone needs to do this!
Most of that could be like 10 lines of python...
PaperBack exists. It's branded as a joke, but it is functional!