problems with different media

[schumy2001]

I have a nex 1300a dvd and i have the following problem. I have used several dvd-r media. on some disc i can burn a twilight propperly but some disc give me a problem. Nero says that the disc contains not enouhg space. But both the disc have the same capebility. What is the problem.

p/s/ Sorry for the bad english I just drunk some beers