Data disc problems

I am trying to burn a data disc of my jpgs and wmv files. Also a psf file in there. Have a sony dru-700a. Burning to dvd-rw disc. I just finished successfully burning my mp3s to same type of disc. Using nero smart start. Have also tried by drop and drag in nero express. I get as far as hitting the burn button, and then it tells me to insert disc. The disc is in already. Is this the proper type of disc for this application? Or is dvd-r/rw different than dvd-rw?
I ask this because dvd-rw is not listed on insert disc message, just dvd-r/rw. Thanks