It is recommended that logical records relating to the same experimental conditions or 'run' are grouped in one file.
For unlabelled tapes the end-of-file (and end-of-run) is indicated by one EOF mark.
For labelled tapes the end-of-file (and end-of-run) is indicated by an EOF mark and the associated EOF records [5].
End-of-data on the tape (and end-of-file) is indicated by two consecutive EOF marks. It is NOT recommended that files (runs) span from one tape to another.
END-OF-TAPE. It is NOT recommended to write past the EOT reflective marker, therefore, on detection of the EOT marker, the software should backspace over a sufficient number of data records to allow the required end-of-run and EOF records to be written.
RECORD FORMATS. Logical records and physical records, (i.e. physical tape blocks) normally consist of a number of header words, followed by data. In some cases the number of header words in a physical record may be 0.
WORD LENGTHS. All lengths in the physical header are expressed in words where a word is defined as a 16-bit unsigned integer. The logical record wordlength is defined in the physical record header.