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I used to do the same thing with par2 files on all my anime DVDs. However, in the years since and with all the discs it has not once saved me. As it turned out, disc errors were never within the correctable range. Either a disc was ok, or too much was bad. I had much better luck reading marginal data using another DVD drive (different brands often have strengths and weaknesses).
I would say, it's worth it if it's fast, convenient, and you have space left over. However, don't spend too much time on it.
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