When reading data from the disk the machine needs to change the CDs RPM. When the data is read from the inside it spins at 500 RPM, decreasing slowly as it reads through all the data across the disc until it slows to 200 RPM for the data round the outside edge.
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@ the RPM Pedants
When reading data from the disk the machine needs to change the CDs RPM. When the data is read from the inside it spins at 500 RPM, decreasing slowly as it reads through all the data across the disc until it slows to 200 RPM for the data round the outside edge.