I can't burn multi-session on DVD-R

Hi all. I’m not sure if i’m in the right forum or not coz i’m new here. I’m sorry for this…

Anyway i’ve jut got a new DVD burner (Sony DRU-700A), so far I couldnt burn a DVD multi-session as I tried to continue session of the previous DVD disc (data discs). I have tried both -R and -RW. Is that a problem with media or the Drive itself?
please help! I appreciate it

what program are you using to burn DVDs with ?

I use Nero version…thats the only software that I use!!!