The BBC's Domesday Project is a case in point. It was based on the BBC Micro and data was stored onto 12-inch digital laser disks. The data consisted of articles, photos, video clips, etc., gathered and submitted by school children about their local communities and lives. But then the technology all changed. The disks - what remains of them - are now unreadable. Various University salvage projects have foundered. The entire project has now disappeared without trace, as has the Project's various web sites.