Is it the DVD-R og my backup?

[Friis]

Hi i'm using PRINCO DVD-R for backing up my xbox games. I'm used these discs before but this time my xbox just claim that there isn't inserted a disc. Is i because of my discs or when i copyed them using ftp from the xbox to my pc? I've got one game working this time but none of the other will.

Hope that you can help me

Friis

P.S. I use the databurn method but have also tried to make an xiso and burn it as an iso. Still doesn't work