DigiTimes has reported that CMC Magnetics recently received certification for their 4x DVD-R DL media. According to the article, they are the first Taiwanese manufacturer to do so.
CMC Magnetics, the largest producer of optical discs in Taiwan, recently obtained certification from international vendors for 4x DVD-R DL (single-sided double-layer) discs, the first among Taiwanese makers and the second in the world next only to Japan-based Mitsubishi Kagaku Media (MKM), according to industry sources.
The article also mentions that due to cost considerations, Verbatim/MKM may release OEM orders for 4x DVD-R DL discs to CMC. If you'd like to read more, head on over to DigiTimes.