The 2GB limitation applies to individual files you want to burn on a iso9660 filesystem.
In the case of Knoppix image -and this is the magic word: "image"- what you have to do is burn the pre-formatted iso9660 image into the dvd, not burn the iso file as a file.
If you use the program 'growisofs' (part of the dvd+rw-tools package):
bash# growisofs -dvd-compat -Z /dev/dvdrw=knoppix.iso
The line above will do the job (given your burner is /dev/dvdrw). However:
bash# growisofs -dvd-compat -Z /dev/dvdrw knoppix.iso
Without the 'equal' sign you will try to burn knoppix.iso as an individual file inside the dvd iso filesystem. For instance:
bash# growisofs -R -J -Z /dev/dvdrw *.mp3
That will copy your mp3 files to your dvd; if you mount the dvd, you will see your mp3 files.
However, if one of your mp3 files if bigger than 2GB, then growisofs will fail and you will make yet another coaster.
Hope that helps...
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