A file section is that part of a file which is recorded on one tape.
If a complete file fits on one tape, it consists of only one file section. If a file consists of several sections, the first section of this file must be the last or only section on a tape, each intermediate section must be the only section on a further tape, and the last file section must be the first or only section on a tape. All file sections can be identified by means of their sequence numbers, which start with 1 (DIN 66029).
A file set consists of one or more files with a common file set identifier. The files of a file set can be identified by means of their sequence numbers, which start with 1. They may be recorded on one or more tapes (DIN 66029). The file set identifier is the volume serial number (VSN) of the first tape in the file set.
Furthermore, all files of a file set must have the same label and code characteristics and file protection attributes.