I bought a machine (4 head DVD recorder)-Magnavoix) to tape my old VHS to DVD's. I was told to us DVD+R and they seem to copy fine and on try them on the machine and they look good. However if I take the DVD out and put it into one of our other DVD players, it keeps say "READING" and then nothing comes on the screen, I have tried 2 different DVD players, what am I doing wrong?