[ubuntu] Trouble burning CDs

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http://ubuntuforums.org – I haven't been able to burn CDs. I went to "Disk Utility" and it said there was an "Error ejecting media". The last time I burned a CD (a little over 2 months ago) there must have been an "unknown error". I clicked on "Details" and it said "No medium in drive". Can someone PLEASE help me get rid of the icon that says there's still a CD? (Hardware)