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The motor in a CD player (or any "disk medium" player) is necessary to spin the CD at a speed that the laser pickup can "read" the data on the disk. As the laser pickup moves along the surface scanning the disk, it causes the motor to slow down as it gets further out on the disk so the data is still read at the correct speed. Or just the opposite, reading from the outside egde of the CD the laser needs to read constitantly so the disk motor speeds up for the smaller circumference of the data on the disk. A combination of elecltronics monitors the motor speed, the data being read and the location of the laser computing the time necessary.

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Q: How does a CD player motor work?
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