Multi-speed
And to think that someone could consider one disc spinning at
different rates at the same time. AT the beginning of the disc the
rate is fixed until the servo locks in. When the pickup is tracking
the outside tracks near the end the RPM is slower. At stadard speed
the data sectors are coming off the disc at 75 per second. The magic
buffer size is one that contains a full disc revolution at the outer
edge of the disc. Bigger doesn't seem to buy much. Double speed can
reduce the time to read sectors at the outer edge as well as improve
transfer rate.