Two studies examined relations between features of external‐memory repositories (personal computers) and confidence in knowing. Participants judged their confidence in knowledge related to their work or studies and then answered questions about the way they store and use information. Participants who maintained more organized repositories were more confident in their knowledge. Furthermore, moderation analyses showed that the participants who navigated through their files by manually clicking through folders to find documents, but not those who use an automated search feature, felt more knowledge confident if they maintained a well‐organized electronic repository. These results provide evidence for relation between assessments of internally ‘stored’ knowledge and the degree of organization of their externally stored ‘knowledge.’ Copyright © 2016 John Wiley & Sons, Ltd.