It is soon time that all disc are 8x speed or higher and 4x disc are not available.
Can I use with my 4x burner 8x disc, if writing speed is 4x? Or can I update my Liteon 451 that is shoud capable to use 8x disk (4x speed) in future?
There isn't a "speed break" problem from going from 4x to 8x (unlike the 2.4x to 4x jump that affected some of the other burners). The 451 is perfectly capable of burning 8x discs at 4x without difficulty.