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I’m sure you’re aware of the Domesday Duplicator[0] and related projects.

There’s several MegaLD/LDROM² discs that need preservation that I hope I can help with one day.

0 - https://github.com/simoninns/DomesdayDuplicator/wiki/Overvie...

The use of multiple copies to remove dropouts has been interesting there too. Think MAME just added some of the games in a couple of months ago that have been thru this process. So even if they have a copy your copy could be of use.

Not just dropout: the disc stacker will set each pixel to the median (if there are enough copies) or an average (if there are just two) so even slightly off pixels on one disc of three, will be caught/fixed. (You can do the same thing with VHS, but not with their stacker software. You'll need to resort to VapourSynth or Avisynth/Avisynth+.)

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