# File test/backup/ProDOSDisk.rb, line 14
        def dump_catalog
                s=""
                files.keys.sort.each { |file_name|            
                        file=files[file_name]
                        s<< "#{sprintf('% 6d',file.contents.length)}\t #{file.file_type} : $#{sprintf '%X',file.aux_type}\t#{file_name}\n"
                }
                s
        end