User's Manual

UNIVAC SERIES 70 (US70) MAGNETIC TAPE ORGANIZATION
XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL 6-3
followed by up to seven file header labels, HDR2 through HDR8 (see
table 6-4).
Table 6-3. Standard header label format (HDR1)
Field
Character
position(s)
Name Length Description
1 1-3 Label indentifier 3 HDR
2 4 File header label
number
11
3 5-21 File identifier* 17 Identifies the entire file.
4 22-27 File serial
number
6 Identifies a file/volume relationship. This field is
identical to the volume label (field 3). On a multi-
volume file, this field is identical to the volume
serial number on the first volume.
5 28-31 Volume
sequence
number*
4 Indicates the sequence of a volume in file (0001-
9999). Used with multi-volume files.
6 32-35 File sequence
number
4 Indicates the sequence of a file in a multifile set
(0001-9999).
7 36-39 Generation
number
4 Indicates the editions of the file (0001-9999).
8 40-41 Version number
of generation
5 Indicates the version of a generation of a file (01-
99).
9 42-47 Creation date 6 Indicates the year and the day of the year the file
was created. The format is:
Position Content Meaning
1 Space None
2-3 00-99 Year
4-6 001-366 Day of the year
March 4, 1967 would be entered as 6
7 0 6 3
10 48-53 Expiration date 6 Indicates the year and the day of the year the
volume may be written on. This field has the
same format as Field 9.
11 54 File security 1 0 = No security protection
1 = This file has security protection.
12 55-60 Block count 6 Six spaces. This field in the file header label is
not used.
13 61-70 Reserved 13 Thirteen spaces.
14 74-80 Reserved 7 Seven spaces.
* Fields 3 and 5 are used by the operating system.