[ubuntu] Unable to mount blank dvd-r disc

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http://ubuntuforums.org – Hi, sorry if this has been answered before. Everytime I insert blank media into my laptop I get the error message 'Unable to mount blank dvd-r disc'. This happens on 12.04, 12.10 & 13.04 on both fresh installs and fully updated systems 32bit or 64, If I click on ok the message goes away and I can use the disc as normal (burn images etc). It's not really an issue I guess, Just a minor thing. My laptop is an Acer x54c so I'm not sure if it is related to my hardware or not (Ubuntu runs beautifully on this laptop) so not sure what the problem is. Attached Imag (Hardware)