The invention relates to a mobile radio transmission unit for transferring data to a control andor signal processing unit. This is in favor of reduced machining cost. ; and if data is received from the host computer group, the supply power control unit releases the sleep mode. In one aspect, elements of the code are printed on a black and white document, as blue dots in content locations and as yellow dots in background locations. The method further includes obtaining offset data for a plurality of access requests associated with the plurality of LBAs.