DVD burning problem

I have had the same problem and I have three burners set up on the same computer all of them did the same thing, Like sandrew said try a different dvd-r or dvd+r I noticed when I put in the right one it worked fine, I think nero Has a test to see what your speed is and to check out what type it is, How old is the dvd burner Let me Know there are some other type of tests we can do Hope that Helps you out. Other than that Maybe its just gone bad

if you have tried different dvd-r and dvd-rw discs, unfortunately it's a sign that your writer is failing to read the discs correctly, this normally happens when the writer is about to give up, although it may still write and read cd's but not dvd's