why is it when i try to record somthing onto a vertibam dvd from an lg dvd recorder i get this bloody error message cannot play back due to disc error , then unknown disc please try again. most of the time thank fully its ok ,but then you get one that just don't want to play ball . whats the hell is going on? just been trying to put totps on to disc ,& blow me it does just that , which means i have to go back & do it all again . is there any magic formula out there i can use to stop this? thanks