I have my project done in dvda. its telling me my disc is 4.5gig. i made an iso from it and the file size is only 4.09gig. yet it wont burn in nero either. its saying i need a DLdisc.
Can anybody explain this? never had file size problems in dvd studio pro. Everything just worked.

DVDA WILL over estimate the file size everytime. No reason that I know of for it it just does. Everytime I render out a project I use a bitrate calulator I KNOW it's spot on and DVDA will tell me it's bigger than it is.
As for not burning in Nero I really don't use it so I have no answer for that but just be aware that DVDA will tell you the file is bigger than it actually is. Check the size in the explorer that way you know for sure.

Don