Problem is when copying, it will not copy the entire DVD

I acquired a DVD multi-format recorder (brand is Memorex) which was also supposed to be able to print LightScribe labels. It came with a Nero Essentials 7 software. The problem is when copying, it will not copy the entire DVD, only portions of it. There is no message of an error. Also, after copying DVD, I attempted to create a label using LightScribe.
After creating a label and I looked in “Preview” then clicked “'Print LightScribe Label.” After a few seconds a message came out saying “Printing Successful.” I took the DVD out but it had no label. Can you please tell me what went wrong? Thank you.
