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Originally Posted by The Avon Lady
Is your SH3 DVD disk scratched or dirty? Try washing it with cold water and dish soap and drying with nonabrasive tissue paper.
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Just an FYI from a person who's had some training in archival and restoration techniques: there is no such thing as non-abrasive tissue paper. The wood pulp used in common tissue paper is very abrasive on a microscopic level. I'm not sure about how damaging such scratches actually are on a DVD/CD, or if such scratches are damaging at all - I think it takes quite a lot of diffraction to cause skipping. But to avoid scratches altogether it's best to use 100% cotton with no impurities (cotton wool balls are good, but they must be 100% cotton).
I just thought it might be good to share the small amount of knowledge I have on this issue, since we gamers use these CDs/DVDs a lot.