In the oldest drives, which run at one-times ( 1×) speed, the disc begins rotating at 500 rev/min, slowing to 200 rev/min when the middle of the disc is reached. As the drive’s laser head moves towards the centre of the disc, the disc’s rotational speed, also known as its angular velocity, increases automatically. This type of external drive usually accommodates up to six discs.Īll CDs are played from the centre of the disc.
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