Multiple corruptions andor erasures in data storage or data communication systems are corrected. According to the invention, in order to achieve an optimal usage of the transport system, the separation between two adjacent objects for transporting is recorded by sensor and provided to an analytical unit as measured values for determination of a correction value for temporary alteration of the speed of a transporter supporting only one object, arranged between two adjacent transporters. The gatekeeper compares the requested URL to URL entries in an approved URL table. If it is determined that ink has not been ejected according to the change in the output signal, after conducting a correction of a gain of the light receptor according to the output signal of the light receptor in order to make the output signal of the light receptor suit the determination of ink ejection, the determination of whether or not ink has been ejected is made again.