not mount blank dvd

[sergio corella gasch]

Binary package hint: gnome-disk-utility

I tried to mount manually but still does not recognize, I can not burn dvd and cd.
I followed this guide in Spanish:
http://ubuntu-guia.blogspot.com/2010/09/cd-dvd-no-monta-en-ubuntu-fstab.html
But the result is the same does not mount and burn programs I do not detect empty disc
thanks for your attention

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gnome-disk-utility 2.32.1-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Sun Jun 12 18:53:45 2011
ExecutablePath: /usr/bin/palimpsest
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=es_ES:en
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-disk-utility
UpgradeStatus: No upgrade log present (probably fresh install)