I have had similar results and have spent 20 hours trying to undrstand whats happening.
I use a program called DVDXcopy and have been for months. No issues wit three other brands of dvd burners, sony, hlds, hp etc.
Use cheap ritek and princo DVD-r's and not any real issues.
Like to use 2 dvd bruners, one to rip and when the rip is done the other is loaded with the dvd-r and DVDXcopy lets you start the burn automatically...neat, dont hae to be there to feed dvd in.
Well the NEC was purchased because its fast brun times....
I could not get the NEC to burn with dvdxcopy in this manner, but could burn with Nero and Roxio with the cheaper DVD-r's .
Thought it was DVDXcopy, but i found if i changed the burn media in the NEC 2500A to a DVD+RW (HP brand), the burn kicked off automatically with no problems!!!
Its the NEC drive that seems the issue, NOT the IDE controller etc. I used both INTEL, NVIDIA and native windows IDE drivers....not a problem.
Seems like this drive has a probleml burning to dvd-r's ritek and princo for me.
Neat to have a fast burner but have to buy the more expensive media!
Need NEC to fix firmwarwe!