Una pregunta... qué versión de cdrecord tienes instalada, una de ésas que está parcheada para poder grabar DVDs? O es el original con soporte únicamente para CDs? Compruébalo en la consola:
[dan@dan ~]$ cdrecord --version
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 Jörg Schilling
Note:
This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to
http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this version.
[dan@dan ~]$