Big problems plz help!

im using nero vision 4.5.0.24 to make a dvd out of an avi file
when pressing disc info at the bottom i see:

it tells me that its only using 4.37 out of 4.8gb


but when it gets to the part where it actually burns to the disk i get this error message

and the cd tray ejects
ive tried other blank dvds even other brand names… does the exact same thing
so i decided to instead of burning to a disk to save the dvd files to the hard drive and try to burn it from another program
but then i noticed something…
the video_ts folder is 5.11 gb

whats up with that???
please help!

ok update… the drive is not the problem because i used clonedvd2 to shrink the video_ts folder on my hd and burn it and it did fine…
the problem is nero making the folder too big… wutsup with that how can i fix this problem?

what i usually do is run the avi file through divx to dvd to get a video ts file. then i run the ts file through dvd shrink and burn to a rewriteable disk. if there are lockups, stalls, or any other errors i run the ts through nero recode using the advanced analysis (if it will let me…doesnt sometimes). once the video comes out the way i like it, i burn it to a disk at 8X. ive been told that 4x gives you a better video quality, but the movies ive burned at 4x always lock up on me so i go with what works for me. hope this helps.