The Cybermen used infostamps to transmit information to their databanks and inserted them into their chest cavities to learn particular subjects. Some of the data stored on these infostamps was stolen from the Daleks while the Cybermen and they were in the Void. A Cyberman was apparently able to detect if an infostamp was corrupted simply by holding it with the cap at one end open. It was similarly able to repair the infostamp by doing much the same thing.