GameCube optical disc pits&landspic.twitter.com/bbdeI7lrjo
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I guess that the "dots" on the bottom of Action Replay disks for GameCube simulate these scars well enough to trick the protection system?
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?
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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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I have a demo disc from E3 eons ago that I could check later
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Update: found this, didn't see anything visible (also looked at the disc under 10x magnification)pic.twitter.com/y1BPUgMd16
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As far as I can see, the Datel disc looks just like any other GameCube disc... Give me a shout if you need better pictures...pic.twitter.com/LCC8kDbToU
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It's more subtle. You need to look at it through a light and identify 6 very slight radial "holes" in the data area. They should be there in the official, but not the Datel disc. Both discs should have a transparent BCA ring (the dark band) but only 6 extra marks on the original.
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