Patent ID: 6747926
Filing Date: 2004-06-08
Classification: G11B

Abstract:
A method of setting a rotational speed for a rotational readout of useful data stored on a disc-shaped storage medium approximately in data tracks, the data tracks being situated concentrically with an axis of rotation of the disc-shaped storage medium in a playback device, the method comprising:determining an outermost data track which is opposite the axis of rotation and has been written with useful data on the disc-shaped storage medium; determining a value for an amount of data stored in the outermost data track, the value being determined by measurement; setting the rotational speed as a function of the amount of data thus determined and a data transfer rate, the data transfer rate indicating a maximum amount of data that can be read out by the playback device per unit of time, so that useful data stored in the outermost data track can be read out at the data transfer rate when playing back the disc-shaped storage medium; and keeping the rotational speed constant when playing back the disc-shaped storage medium.