The CDR-Zone has published an interesting media review of the Verbatim 4x DVD-R DL disc. Based on this review it seems that Mitsubishi and Verbatim have been able to maintain their excellent quality. Here is a quote from the conclusions of the review:
The reported Pi Error and PI Failure results in our Quality tests section showed very low error levels with generally very good beta/Jitter/TA and peak shifts results at a 4x recording speed. The exception to this was the Liteon 1693S with firmware KS04 which seemed to have very even beta although this disc was perfectly playable in our DVD standalone players capable of reading this media.
Most of our review recording devices saw the Verbatim 4x DVD-R Dual Layer media as having a maximum recording speed of 6x and we hope to bring you some overspeeding results via our Media forum as we manage to source some more pieces. Judging by the very good Quality tests results we are happy to predict that 6x recording should not be an issue for this media on any of the drives supporting 6x recording.Read the review at CDR-Zone.COM