The speed of CD, DVD and Blu-ray drives are all measured on the same scale, based upon the original 1.2 megabits per second data transfer rate of the first CD drives.

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The speed of CD, DVD, and Blu-ray drives are measured on different scales, as each format has a different base data transfer rate. CD drives are based on 1.2 Mbps, DVD drives on 11.08 Mbps, and Blu-ray drives on 36 Mbps.

The Speed of CD, DVD and Blu-Ray Drives Are All