The issue is reported even for dvd+rw-tools > 6.0 I've found this: http://www.destr0yr.com/article.php/unable-to-anonymously-mmap/print And the following suggestion on another site: "Go to K3B's config, Programs tab, User Parameters. Add the following parameter for growisofs: -use-the-force-luke=bufsize:16m" Hope this helps.