Abstract: A circuit arrangement for addressing a disc storage device in a system for processing data signals, such as a teleprinter and data exchange system, incorporates disc storage devices of two different types, and conversion circuit for automatically converting addresses serving to address storage zones of a disc storage device of a second type (differing from a first type) into relative addresses relating to the desired information block in the first disc storage device, and for converting such relative addresses into absolute addresses which designate the desired information blocks.