Most people (well, probably older folks at this point) have had a DVD or CD player that plays discs that are scratched or covered in smudges, but another (generally cheaper) device cannot play it at all, or poorly. Why are some devices able to play flawed discs while others struggle?
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https://en.wikipedia.org/wiki/Cross-interleaved_Reed%E2%80%93Solomon_coding
Flawed discs have missing info. However, CDs have built-in algorithms and you can figure out what the missing data is based on the neighboring data (you can literally drill a small hole in a CD and it’ll work).
Now, as to how some players are able to read more flawed discs that other players can’t, I sadly can’t answer that. If I had to give an educated assumption, it’s based on their processors for using these algorithms to find the missing data.
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