Yes you are correct. I did not realise until I tried to burn a DL and it failed to burn. I upgraded to OB and all is fine. Thanks!
One thing of note. I wish I had bought the -R DL media now since even when bitset to DVD-ROM the discs failed to play in my stand alone Pioneer DVD-R DVD recorder. Luckily I have another DVD player that works with the discs but I have to manually switch to it to use it. Ah well you live and learn.