Information recording/reproducing apparatus including a plurality of recording or reproducing rates

摘要

An apparatus for recording or reproducing information on or from a recording medium such as a disk which rotates at a constant angular velocity. This apparatus comprises: a system to record or reproduce the data on or from the disk; a circuit to designate the recording or reproduction address of the data on the disk; and a control circuit to control the data recording or reproducing rate for the disk. The control circuit makes the recording or reproducing rate constant for a predetermined data and changes the recording or reproducing rate for the other data in accordance with the recording or reproduction address. In this apparatus, by providing track groups in the header portions and data recording portions in the direction of radius of the disk, the clock rate can be easily changed and the recording density is increased and the access time is reduced.