ANSI INCITS 72 : 1981

1. Scope and Introduction
   1.1 Scope
   1.2 Introduction
2. Definitions
   2.1 Magnetic Tape Cartridge
   2.2 Flux Reversal
   2.3 Density
   2.4 Recorded Block
   2.5 Data Block
   2.6 Initial Gap
   2.7 Interblock Gap
   2.8 In Contact
   2.9 Control Block (Tape Mark)
   2.10 Preamble
   2.11 Postamble
   2.12 Cyclic Redundancy Check (CRC) Character
   2.13 Beginning of Tape (BOT) Marker
   2.14 End of Tape (EOT) Marker
   2.15 Load Point (LP) Marker
   2.16 Early Warning (EW) Marker
   2.17 Amplitude Reference Tape
   2.18 Standard Reference Current
   2.19 Standard Reference Amplitude
   2.20 Track
   2.21 Frame
3. Recording
   3.1 Method
   3.2 Equipment
   3.3 Density
   3.4 Flux-Reversal Spacing
   3.5 Signal Amplitude
   3.6 Erase
4. Format
   4.1 Number of Tracks
   4.2 Use of Tracks
   4.3 Byte and Code Requirements
   4.4 Gaps
   4.5 Block Length
   4.6 Control Block (Tape Mark)
   4.7 CRC Character
   4.8 Usable Recording Area
5. Revision of American National Standards Referred to in
   This Document

Gives a format and recording standard for a 0.250-inch (6.30-mm) -wide, 4-track magnetic tape in a cartridge to be used for information interchange between information processing systems, communication systems, and associated equipment utilizing the American National Standard Code for Information Interchange, ANSI X3.4-1977 (ASCII).