User's Manual

XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL 6-1
6. 6UNIVAC Series 70 (US70)
magnetic tape organization
This chapter describes the UNIVAC Series 70 (formerly RCA Spectra
70 Magnetic Tapes) magnetic tape organization. It also describes
header and trailer labels, tape configurations, data formats, and
includes a sample JSL.
Labeled tapes
A minimum set of US70 standard labels includes a volume label
(VOL 1), one standard file header label (HDR1), and one end-of-file
trailer label (EOF1) or one standard end-of-volume label (EOV1).
The minimum set of labels may be expanded by adding up to seven
of each label type. For example, a file label could contain eight file
header labels, HDR1, HDR2, HDR3, up to and including HDR8.
Additionally, the user may include both user header labels (UHL) and
user trailer labels (UTL). Up to eight of each of these labels may be
used. For example, UHL1 through UHL8 and UTL1 through UTL8
can be added.
Label groups and sets
This section describes header label groups and sets, and trailer label
sets.
Header label group
The header label group consists of the volume label, file header
label, and user header label sets. These label sets are contiguous
within the header label. For example, if a HDR2 label is used, it must
follow a HDR1 label.
The header label group is always ended with a tape mark (see figure
6-1).
Figure 6-1. Header label organization