I just started trying to record my home movies and some tv programs on DVD. But I can only play these recorded DVDs on my recording device (SANYO DRW-500). They won't play on other DVDs. My tv gives me a message like "can't read this dvd." Does anyone know what I might be doing wrong? DVDs are DVD+R. I read somewhere in this forum that DVDs must be finalized. Does anyone know what this means?