_NEC DV 5800A trouble

I reformatted my computer yesterday, so I lost everything. While trying to burn information on to a Sony AccuCORE DVD-R 4.7Gb disk using nero. My dvd drive doesn’t “see” the disk when I have it inserted. I can still play normal DVDs like from BlockBuster, but anytime I try insert this sony dvd-r to use, Nothing… Please help.