Not only that, capturing the visible video with a capture card doesn't capture the data contained in the vertical blanking region, where many LD arcade titles store data used by the games. Even worse, the digital data stored in some audio tracks can get mangled.
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However, I have heard rumors - unverified, but from people I'm inclined to believe - of players where the pickup *additionally* has a signal for whether or not it was successful in grabbing a given sample.
The reason why this would be important for coming up with a theoretically perfect dump is that many discs these days have minor dropouts that would be quite difficult indeed to correct manually by merging together captures of multiple different examples of the same disc.
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In principle, knowing whether a single sample of the analog data was "good" or not would enable a sufficiently dedicated person to construct a capture with *zero* horizontal streaking or other artifacting due progressive rot.
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If you digitize a vinyl LP or an audio cassette 100 times, you will get 100 different sets of digital data, and no one of them, nor any composite you can make from them, are "correct". This is true for all analog recording systems.
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