For example , writing to a CD at 8X will be twice as fast as writing onto a disc at 4X .
In order to market increasing drive speeds , manufacturers used the symbol nX , whereby n is the multiple of the original speed .
Writing to a CD at 8X will be twice as fast as writing onto a disc at 4X .
In order to market increasing drive speeds , manufacturers used the symbol nX , whereby n is the multiple of the original speed .