Burning with Mitsumi 4802TE!!

I`ve tried to burn DC boot disks using this drive but none of them work?
i have used the nero image and it burns ok but wont work in my dreamcast??
Any help is appreciated

[2000DC]

Are you sure your CD writer supports Disc-At-Once??? If it doesn't, then you have to find somebody who has one, or else it won't work!