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If you want to Erase CD-RW/DVD-RW in Ubuntu use the one of the following options
Option 1
Open your terminal and run the following commands
umount /dev/cdrom
cdrecord dev=/dev/cdrom blank=fast
Option 2
Install brasero using the following command
sudo apt-get install brasero
After installation you need to go to Applications/Sound & Video/brasero.One of the options on the Disc menu is to erase the disk.
You can also use k3b.
Brasero seems to have alot of suckage. I really cant believe they chose it for the default in 9.04.
Its a very on again off again program.
You can also use Gnome Baker.