I have a Plextor 708a burner and 2 stand alone DVD players. I can burn the same image on the same media but one of the DVD players will only play a DVD if it burnt at 4x speed while the other can play 8x or 4x. If the media is the same why does one player only read 4x burnt DVDs? How does burning speed cause this? It seems that "burning" is "burning". I just wondering the whys of this if anyone knows.

Thanks