Specifies the physical and magnetic characteristics of a 0.5-in (12.65-mm)-wide 128-track magnetic tape cartridge, to enable physical interchange of such cartridges. It also specifies the quality of the recorded signals, a format - called Digital Linear Tape 3 Extended (DLT 3-XT) - and a recording method, thereby allowing data interchange between drives. The use of a labeling standard such as American National Standard for Information Technology - File Structure and Labelling of Magnetic Tapes for Information Interchange, INCITS 27-1987 (R1998), will support data interchange between data processing systems