I just purchased 50 Taiyo Yuden DVD+R 4X 4.7GB because this was one of the brands of blank media that Sanyo recommends in the instruction manual. I have used 3 of them to record home videos from VCR and they play back fine on the recorder itself but when I try to play them on my Phillips DVD player, one of them has picture but no sound and the other 2 display "no disc". I have finalized them so this can't be the problem. I have also done the firmware update. I have previously used Verbatim Digital movie DVD's and had no problems playing them back on the Phillips. Does anyone have any idea why this is happening?