Method for regulating a rotational speed

Abstract

A method for setting a rotational speed for rotational readout of useful data stored on a disc-shaped storage medium in a playback device, permitting utilization of a maximum possible data transfer rate at a constant rotational speed. The useful data is stored approximately in data tracks arranged concentrically with an axis of rotation of the disc-shaped storage medium. An outermost data track which is opposite the axis of rotation and has been written with useful data on the disc-shaped storage medium is determined. A value is determined for the amount of data stored in the outermost data track. The rotational speed is set as a function of the amount of data thus determined and a data transfer rate, where the data transfer rate indicates a maximum amount of data that can be read out by the playback device per unit of time, so that the useful data stored in the outermost data track can be read out at the data transfer rate in playback of the disc-shaped storage medium. The rotational speed is kept constant when playing back the disc-shaped storage medium.

Dependencies are inferred from the claim text.