Fast facts: About 15% of all blanks I could after burning in the barrel kloppen (Whether PC-own burner or hard drive DVD recorder was used). More about 15% had quirks, for example warped soundtrack (1 sec to go) or distorted picture. For information, I would not leave me in the important back-ups on it. Next time I'd rather spend a few euros more and it does not burn after each have a concern that I have to do it again.