CD And DVD Writing Speed
Original CD-ROM drives could read data at 150 kibibytes (150 × 210 bytes) per second. As faster drives were released, the write speeds and read speeds for optical discs were multiplied by manufacturers, far exceeding the drive speeds originally released onto the market. In order to represent this exponential growth in drive speeds, manufacturers used the symbol nX, whereby n is the multiple of the original speed. For example, writing to a CD at 8X will be twice as fast as writing onto a disc at 4X.
Read more about CD And DVD Writing Speed: CD, DVD and Blu-ray Writing Speeds, Theoretical Versus Practical Writing Speed, Optimal Writing Speed, Other Media
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