GameCube optical disc pits&landspic.twitter.com/bbdeI7lrjo
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Datel discs just embed the same errors directly into the bitstream (at the same logical addresses but no longer the same angular position). I don't own one so I don't know if they're visible, but I don't think they are?
Basically the idea of the protection was that you cannot predict which sectors you hit with a radial scratch, but it turns out the check doesn't care about angular relationships, so you can just encode the "scratch" into the data from the outset.
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Of course it also turns out they used symmetric crypto to secure the metadata about the errors, so these days anyone can just replicate the original process with the key... But I don't think anyone has ever done so.
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Hello I have mini-DVDs that I'd love to get around using someday.
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