Look Cuervo, this is what I have in the /etc/fstab file:
/dev/sda1 / ext4 defaults 1 1
none /dev/pts devpts defaults 0 0
/dev/sda3 /media/Datos ext4 uhelper=hal,nosuid,locale=es_ES.UTF-8,nodev 1 2
/dev/sda4 /media/Multimedia ntfs-3g defaults,nosuid,nodev,uhelper=hal,locale=es_ES.UTF-8 0 0
none /proc proc defaults 0 0
/dev/sda5 swap swap defaults 0 0
I'm affraid to modify something here. The sda3 /media/Datos is here classified as an ext4