Hdiutil segment to split a dmg

I am trying to split a large dmg file into smaller pieces for burning onto dvd.
Using the command:
hdiutil segment -segmentSize 4g -o foo.dmg foobar.dmg
Here is the result:
hdiutil: segment: format WRDU not recognized
hdiutil: segment failed - Operation not supported
This is on a UDRW dmg created with hdiutil. I can attach to it via gui and with hdiutil.
Can anyone help?

..."This is on a UDRW dmg created with hdiutil."...
Actually, the 'man' page for 'hdiutil' says:
..."Segmenting read/write (UDRW) images is not supported (as of OS X 10.3)."...
Presumably that hasn't changed in 10.5.
Perhaps the image can be converted using 'hdiutil' to another format, such as UDRO or UDBZ, prior to segmenting.

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