User's Manual

UNIVAC SERIES 70 (US70) MAGNETIC TAPE ORGANIZATION
6-4 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
User header label
The user has the option of including up to eight user header labels on
a labeled volume. A user header label contains one field which
consists of any characters the user wishes to include. User header
labels, if included, follow the file header labels. Their contents are
contained in table 6-5.
Trailer labels
The trailer label group consists of the end-of-file or end-of-volume
trailer label sets and the user trailer label set. The end-of-file trailer
label set indicates the end of a file. It is followed by one tape mark
unless the file under consideration is the last file on the volume. In
this case, the end-of-file trailer label set is followed by two tape
marks. The end-of-volume trailer label set is used when a file is
continued on a subsequent volume. This label set is followed by two
tape marks.
The trailer label group format is shown in figure 6-2.
Figure 6-2. Trailer label organization
Table 6-4. Header label format (HDR2 through HDR8)
Field
Character
position(s)
Name Length Description
1 1-3 Label indentifier 3 HDR
2 4 File header label number 1 2 through 8 in ascending sequence
3 5-80 Undefined 76 Reserved
Table 6-5. User header label format (UHL)
Field
Character
position(s)
Name Length Description
1 1-3 Label identifier 3 UHL
2 4 User label number 1 1 through 8 in ascending sequence within the
UHL set or UTL set.
3 5-80 User’s option 76 May contain any characters