Cannot burn DVD but can burn CD's.

[techlists at phpcoderusa.com]

Hello,

I have a Dell Inspiron 660 running Mint 17 KDE.  I was trying to burn a 
DVD and cannot.  I get a popup shortly after I insert the DVD which 
allows me to open the burner software, however is says something to the 
effect that the medium is not valid.   I can burn CD's but not DVD's.  A 
search of Google turns up a bunch of folks having the same issue with 
their Win boxes.  Most of them said it was a driver issue.

I can play a DVD movie.

Any pointers much appreciated.

Keith