User's Manual

UNIVAC SERIES 70 (US70) MAGNETIC TAPE ORGANIZATION
6-2 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
Header label sets
This section describes volume, file, and user labels.
Volume label
Volume labels provide a means of identifying a given tape. The
volume label set is the first label set on a tape. There may be up to
eight volume labels per tape, but the data field in volumes two (VOL2)
through eight (VOL8) are undefined. The contents of a VOL1 label
are contained in table 6-1. The contents of VOL2 through VOL8
labels are contained in table 6-2.
Note: Unused and reserved fields should be recorded as EBCDIC
spaces (hexadecimal 40).
File header label
The standard file header label (HDR1) identifies a file and indicates
the sequence of the file within a multi-file set. Additionally, it contains
the volume serial number (identical to the volume one [VOL1] serial
number) and the sequence of a volume in a file for multi-volume files.
Each file on a volume with standard labels contains a standard
header label (see table 6-3). Additionally, the standard label may be
Table 6-1. Volume label format (VOL1)
Field
Character
position(s)
Name Length Description
1 1-3 Label identifier 3 VOL
2 4 Volume label number 1 1
3 5-10 Volume serial number 6 Identifies the volume
4 11 Volume security 1 0=No security
1=The volume has or had security protection
5 12-21 Not used for tape files 10 Ten spaces
6 22-31 Reserved 10 Ten spaces
7 32-41 Reserved 10 Ten spaces
8 42-51 Owner’s name and
address code
10 Identifies the owner of the volume
9 52-80 Reserved 29 Twenty-nine spaces
Table 6-2. Volume label format (VOL2 through VOL8)
Field
Character
position(s)
Name Length Description
1 1-3 Label identifier 3 VOL
2 4 Volume label number 1 2 through 8 in ascending sequence
3 5-80 Unidentified 76 Any characters the user wishes