ANSI/INCITS/ISO/IEC 15521:1998 Information Technology - 3, 81 mm Wide Magnetic Tape Cartridge - Helical Scan Recording - DDS 3 Format using 125 m length tapes
ISO/IEC 15521:1998 - This International Standard specifies the physical and magnetic characteristics of a 3, 81 mm wide magnetic tape cartridge to enable physical interchangeability of such cartridges between drives.
ANSI/INCITS/ISO/IEC 15521:1998 history
1998ANSI/INCITS/ISO/IEC 15521:1998 Information Technology - 3, 81 mm Wide Magnetic Tape Cartridge - Helical Scan Recording - DDS 3 Format using 125 m length tapes