are you using re-writeable media and that your player don't play re-writeable disc? Just a guess here.
I have a RCA duel VCR/DVD recorder. I had no problem recording onto DVDs until all of a sudden the last 2 times I tried to record something when I went to finalize the DVD to play it didn't finalize. When I put the DVD into the DVD player instead of the movie title it says Tiny UDF Volume. This has happened the last 2 times I tried to record something. what does that mean?

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