I found that DVD-r's the cheapies are an issue with this NEC 2500A.
I have 4 dvd burners....all of them a different brand.
I have used most all of the available software on three other than the NEC 2500A with the cheapest Ritek and Princo DVD-R's with no real issues. (DVDXcopy, DVDXcopy Express, Nero, Roxio, etc..)
When I bought the NEC 2500A I could not burn the same -rs on the NEC as with the other drives. With most of the software I was using. I switched to DVD+r's and DVD+RW and no problems...
So i thought I would have to use the more expensive dvd media.
Well, I found 2 programs that work well DVD-R medis, the cheap stuff. CloneDVD and DVDFAB. All other porgrams I use will not work with the NEC and DVD-R's on my system.