When you use Copy in NERO, it first copies to the Hard Drive, Then put this on the Blank DVD it asks you to insert. My guess is you Hard Drive may have some disc errors, you need to check it With Disc Checker
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D&AD Awards 2017: see the best design, advertising, illustration, animation and VR of the past year
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.