I bought a TDK BD-R 4x 50GB disk (CMCMAG-DI6-000) and told ImgBurn to burn it at max speed. ImgBurn, apparently, tested all speeds and concluded that it can be burned at 6x.
The disk burned successfully and it was verified by ImgBurn itself.
However 6x is more than the 4x promised in the box.
My question is: is this safe for the longevity of the data on the disk?