ANSI INCITS 56 : 1986 : R2017

1 Scope and Purpose
  1.1 Scope
  1.2 Purpose
2 Referenced Standards
  2.1 American National Standards
  2.2 Other Standards
3 Definitions
  3.1 Magnetic Tape Cartridge
  3.2 Flux Transition
  3.3 Density
  3.4 Recorded Block
  3.5 Data Block
  3.6 Interblock Gap
  3.7 In Contact
  3.8 Control Block (Tape Mark)
  3.9 Reference Alignment Cartridge
  3.10 Preamble
  3.11 Postamble
  3.12 Cyclic Redundancy Check (CRC)
  3.13 Beginning of Tape (BOT) Marker
  3.14 End of Tape (EGT) Marker
  3.15 Load Point (LP) Marker
  3.16 Early Warning (EW) Marker
  3.17 Master Standard Amplitude Reference Tape
  3.18 Secondary Standard Amplitude Reference Tape
  3.19 Standard Reference Current
  3.20 Standard Measurement Current
  3.21 Standard Reference Amplitude
  3.22 Track
  3.23 Standard Length (SL) Cartridge
  3.24 Long Length (LL) Cartridge
4 Recording
  4.1 Method
  4.2 Equipment
  4.3 Density
  4.4 Flux Transition Spacing
  4.5 Signal Amplitude
  4.6 Erase
5 Format
  5.1 Number of Tracks
  5.2 Use of Tracks
  5.3 Byte and Code Requirements
  5.4 Gaps
  5.5 Data Block Length
  5.6 Control Block (Tape Mark)
  5.7 CRC
  5.8 Useable Recording Area

Gives a format and recording standard for a 0.250-in (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 a standard code, as agreed upon by the interchange parties.