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How to burn dual layer dvds using nero startsmart 
Insert the dual-layer dvd into your drive. 
In order to burn a dual-layer project, you must be using a dual-layer dvd, and your drive must support burning dual-layers. If you try to burn a dual-layer project to a single-layer disc, you will encounter errors.
Open nero startsmart/nero express. This program will come installed with certain dvd burners, or can be purchased directly from nero.