I have a sonydru500a... I can backup all of my movies and games...but when I backup my karaoke discs,,,, there is a problem...here is the problem

I had a DVD Karaoke Disc consists of 40 songs....
It's 7.4 gigs total.... so I took out the songs I don't like and finally it reduce the size to 3.8 gigs,,,, after ripping it from DVD Decryptor,,, I got a VIDEO_TS folder (normal)..I then created additional AUDIO_TS folder
I then use Record Max to burn the VIDEO_TS and AUDIO_TS,,but whenever I hit that record button,,it keep saying "Job terminated (errors).....
I can burn movies fine,,but how come it wouldn't let me burn karaoke???
please help thanks
is it because I took out some chapters from the dvd that give me error????