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Originally, compact discs were developed for the audio industry with a speed of 150 KB per second or what is now known as 1x: 1x means it takes 1 minute to record or to listen to (read) 1 minute of audio or equivalent data. CD technology advances have raised the speeds to multiples of 1x: 2x (twice the speed), 4x, etc. A CD recorder may have three speeds: 8x4x32 where the 8 is the maximum record-ing speed, 4 is the maximum rewrite speed,and 32 is the maximum reading speed.

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