ISO/IEC 11559:1993, Information technology - Data interchange on 12,7 mm wide 18-track magnetic tape cartridges - Extended format

Specifies the physical and magnetic characteristics to enable interchangeability of the cartridges, the quality of the recorded signals, the format and the recording method, thus allowing, together with ISO 1001, full data interchange, extensions to the transformation of data before it is formatted as in ISO 9661. Cartridge and recording method being identical with those described in ISO 9661. The permissible routes for the flow of data are shown in annex H.