Can't burn DVD using NeroCmd

I’m trying to burn 685 MB of data files to a DVD using NeroCmd, but it keeps telling me that “There is not enough space to burn this compilation to this disc.”. I’ve tried a number of blank DVD+RW & DVD-R discs, all with the same result. With smaller volumes of files, it works OK, and I can burn the whole 685 MB if I use Nero 6 - just not through NeroCmd. The options I’m using are as follows:

–drivename D
–iso “Monthly (06 - 2005)”

Any ideas?

Roger :confused: