I have two batches of ritek media one by memorex and one by fuji.
I also have two drives a pioneer AO6 and an NEC 2500A.
The ritek media is G03 DVD-R 1X.
In the NEC the Fuji burns perfectly when checking with Nero scandisk but the Memorex is a disaster. The memorex errors out in Nero scandisk yet the Fuji test perfectly.
When both media are burnned in my Pioneer scandisk shows`a perfect scan.
The NEC writes this media at 2X and in the Pioneer the write speed is 1X.
The possibility presented here is that the media is presenting an incorrect write stratagy to the NEC.
I hope this helps in sorting out the problem.
Also my Ritek G04 media labled Ridata works perfectly in my Pioneer and is a disaster in my NEC.