I had a similar problem where my main computer wouldn't recognize a whole series of dvds, but they played fine on my laptop (older) and my regular dvd player. I really can't say what the problem was...my main computer wouldn't even view the contents as data in explorer, but it doesn't have any problem with other dvds (+r or -r). I have noticed it seems to be getting pickier with dust and scratches, so maybe that has something to do with it.
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