DVD-RAM 2...

[ItalianJob]

DVD-RAM 2 (6x/8x/12x/16x) discs could have compatibility problems on older drives.

This french site doesn't give a link to his sources :
http://www.clubic.com/actualite-32041-i ... ram-2.html

Current DVD-RAM 1x-5x burner (Class 0) could not be compatible with DVD-RAM 2 media (Class 1), 6X up to 16x."

[Ian]

We reported on it earlier this week. Essentially TSST issued a warning stating that the newer discs were not compatible with some of their older drives.

http://www.tsstorage.com/info_e/ram2e.html

As far as the incompatibility goes, its been known for months. I believe heise broke the news.