As to a copy of a prerecorded DVD not working, there's nothing mysterious in that.
You're not supposed to copy them and many have all kinds of protection systems including data contained in tracks that can be read by computer players but not written to (thus effectively given the prerecorded DVD a greater capacity than the blank one), realtime compression (which again you can't usually do with your own writer to the same effect), etc. etc..
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duckman
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since Nov 2004