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Burning Speed? –
1x or 2x? What's the final verdict?
Using high quality media like Pinoneer's and Apple's or course?
There is no final verdict. \General view is for DVD-R 1x for crap media, 2x for top media. If you use 1x on yop media, it may burn for too long and splay the marks. But this not a yet reported phenomenon.
I can attest that for quality media like Pioneer, Verbatim, TDK, Apple, and Imation, 2x seems to produce smoother loading and better overall performance than the same discs burned at 1x on a DVR-A03 with both my v1 and v4 machines.
As far as cheap or off-brand media, YOYO (You're On Your Own) as there's no guarantee they are 2x certified and typically get what you pay for...