SpaceSniffer is a freeWare (donations are welcomed) and portable tool application that lets you understand how folders and files are structured on your disks. By using a Treemap visualization layout, you have immediate perception of where big folders and files are situated on your devices.
L. Cajani. Historical Consciousness and History Teaching in a Globalizing Society. Geschichtsbewusstsein und Geschichtsunterricht in einer sich globalisierenden Gesellschaft, Frankfurt, (2001)