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What should happen, if a blank DVD is inserted? Have you set anything in System Preferences > CDs & DVDs?
Does the blank DVD show up in Disk Utility?
 
What should happen, if a blank DVD is inserted? Have you set anything in System Preferences > CDs & DVDs?
Does the blank DVD show up in Disk Utility?

THIS, when you insert a blank dvd you get a popup but you could of once chose "do nothing" or "ignore" but you could go back to system prefs to change this default action again
 
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