DVD-media = what kind of DVD is it, is it a DVD-R, a DVD+R, is it a DVD+RW, is it a DVD-RW or is it a Single Layer DVD or a Dual Layer DVD
Since your Mac seems to recognise the DVD media, why do you not use Finder and its
Burn Folder to burn the data onto the DVD? Or do you need
Disk Utility or the unmentioned burning application?