Its only been Princo that used the TDK header for their crap 2x media, thats all I've ever heard of. I've have a couple myself to test out. Utter crap. The Sigma's have a genuine CMC Magnetics header, they are reprints, where the original printing was smugged and re-printed to Sigma. There are millions (well almost
) of batch numbers, a few drom each run. CMC make CDR's for TDK and maybe quite feasable they make them DVDR's as well. I sould have said earlier they are "reported to be TDK". They clearly are not as they would have TDK headers if they did.
Nadiboy, also dont assume the blanks are made and printed in the same country. Ritek use to make all their stuff in Taiwan and the Australian requiments were all printed here, although that stoped a year or so ago.