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@bdbdbd: I don't know if i quite understand what you are trying to say.. The 1x, 2x, 3x, 4x, ect... is constant for dvds, but it is not the same as the 1x, 2x, 3x, 4x ect for BD, or regular cd's for that matter.

As for the 12x BD, I don't know what the maximum is, it just depends on whether they can keep the disc from wobbling at higher rpms.