It appears that when the CD creator mounts the CD it mounts it read only so that the write fails.
I know this thread is a bit old, but an observation ...
I normally use mkisofs followed by cdrecord to write CD's (and I believe they work with DVD's as well).
$ man mkisofs and $ man cdrecord for the next 3 hours (HINT: 99% of the time you want to use mkisofs options -r and -J)
Nick Bishop, email replies ignored. ----- Disclaimer, n: Advice to the reader that they should put their lawyer away. -oOo-
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