The ISO/ANSI standard volume label (VOL1) is 80 characters in length. The program uses the label to identify the tape volume, tape volume owner, and security of the tape volume's contents. It is always the first block of data on the tape volume if the tape is a standard labeled tape.
| Offset | Data type | Length | Contents | File Type |
|---|---|---|---|---|
| 0 | Character | 3 | Label identifier | |
| 3 | Character | 1 | Label number | |
| 4 | Character | 6 | Volume identifier (Volume Serial Number) | |
| 10 | Character | 1 | Accessibility | |
| 11 | Character | 26 | Reserved | |
| 37 | Character | 14 | Owner Identifier | |
| 51 | Character | 28 | Reserved | |
| 79 | Character | 1 | Label Standard Level |
The field definition follows the industry standards as understood and interpreted by IBM®: (i5/OS™ supports for input only):
The system records the volume label in ASCII.
The program describes the contents and function of each of the fields below. This version of the ISO/ANSI standard is Version 3.
The characters VOL identify this label as a volume label. The system reads this field to verify that a standard labeled tape is mounted, and that this label is a volume label. When you use the initialized tape (INZTAP) command and specify the new volume (NEWVOL) parameter, the system writes this field to the tape.
The relative position of this label within the set of labels of the same type. The Label number is always 1 for the Version 3 volume label.
A unique identification code to identify the logical tape volume. The system writes the value specified for the new volume (NEWVOL) parameter on the Initialize Tape (INZTAP) command in this position. For media library devices, the logical volume identifier should match the external bar code identifier on the cartridges. The value may be from 1 to 6 alphanumeric characters (left-aligned and padded with blanks if less than 6). The alphanumeric character set includes A-Z, 0-9, @, $, and #. If the program specifies a value for a command in the VOL parameter, the system verifies that this field matches the specified value.
The system considers the volume secure (from processing) if the volume security field is a blank. A program with *SECOFR authority can process secured volumes.
The owner identifier of the tape volume. The system writes a value to this field through the OWNER parameter on the Initialize Tape (INZTAP) command. You use the field to write the owner identifier of the volume or to write information about the contents of the volume. If the identifier is less than 14 bytes, the system justifies the value and pads it with blanks.
Identifies the version of ISO/ANSI standards. For Version 3, the program places a 3 in this field.