ANSI INCITS 27 : 1987

1 Scope and Field of Application
2 Conformance
   2.1 Conformance of a Magnetic Tape Volume Set
   2.2 Conformance of an Information Processing System
3 Referenced and Related Standards
   3.1 Referenced Standards
   3.2 Related Standards
4 Definitions
5 Notation
6 Arrangement of Labels and Files
   6.1 Arrangement of Data on a Volume
   6.2 Arrangement of Label Groups
   6.3 Arrangement of File Sections
   6.4 Relationship of File Sections to a Volume
   6.5 Arrangement of Files and File Sets
   6.6 Structure of a Volume Set
7 File Structure for Data Interchange
   7.1 Blocks
   7.2 Records
   7.3 Files
8 Format and Contents of the Labels and Label Sets
   8.1 Character Set and Coding
   8.2 Justification of Characters
   8.3 Volume Header Label Set (VOL1 to VOL9)
   8.4 Installation Volume Label Set (UVL1 to UVL9)
   8.5 File Header Label Set (HDR1 to HDR9)
   8.6 User File Header Label Set (UHL)
   8.7 End of Volume Label Set (EOV1 to EOV9)
   8.8 End of File Label Set (EOF1 to EOF9)
   8.9 User File Trailer Label Set (UTL)
9 Levels of Interchange
   9.1 Level 1
   9.2 Level 2
   9.3 Level 3
   9.4 Level 4
10 Requirement for the Description of Systems
11 Requirements for an Originating System
   11.1 General
   11.2 Files
   11.3 Labels
   11.4 Restrictions
12 Requirements for a Receiving System
   12.1 General
   12.2 Files
   12.3 Labels
   12.4 Restrictions
Appendixes
Appendix A Initialized Volumes
  A1 Purpose
  A2 Specification
Appendix B Main Differences between ANSI X3.27-1978 and
            ANSI X3.27-1987

Defines file structure and labeling of magnetic tapes for the interchange of information between users of information processing systems.