User's Manual
IBM OS/360 AND DOS/360 STANDARD LABELED TAPES
2-6 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
HDR1, EOV1, EOF1 labels
The formats of these labels are identical except for block count. The
formats are shown in table 2-4.
Table 2- 4. HDR1, EOV1, and EOF1 labels (IBM tapes)
Name
Character
position(s)
Field Description
Label identifier 1-3 1 This is the 3-character identifier HDR, EOV, or EOF.
Label number 4 2 This is the number 1.
File identifier* 5-21 3 These are the rightmost 17 bytes of the file name and
includes GnnnVnn if part of a generation data group.
File serial number 22-27 4 This is the volume serial number of the tape volume
containing the file.
Volume sequence number* 28-31 5 This number (0001-9999) indicates the order of the
volume within the multi-volume group created at the
same time.
File sequence 32-35 6 This number (0001-9999) indicates the relative
position of the file within a multi-file group.
Generation number 36-39 7 This field contains a number from 0000 to 9999
indicating the absolute generation number if the file is
part of a generation data group (the first generation is
0000).
Version number 40-41 8 This field contains a number from 00 to 99 indicating
the version number of the generation if the file is part
of a generation data group (the first version is 00).
Creation date 42-47 9 This is the year and day the file was created and is of the
form: byyddd
b = blank
yy = year (00-99)
ddd = day (001-366)
Expiration date 48-53 10 This is the year and day when the file may be
scratched or overwritten. The data is of the same form
as described for creation date
File security 54 11 0 means no security.
1 means security protection; additional ID of file
required before it can be read, written, or deleted.
3 means security protection; additional ID of file
required before it can be read, written, or deleted.
Block count* 55-60 12 This is the number of data blocks in the file on the
current volume (exclusive of labels and tape marks).
For HDR1, this field contains zeros.
System code 61-73 13 This code identifies the system.
Reserved 74-80 14 Blanks.
*Fields 3, 5, and 12 are used by the operating system.