System Control Blocks

Volume Label
A volume label is 80 characters long and
identifies the volume and its owner.
Figure 30 shows the volume label format.
Description of the fields follows the
illustration. Figure 30A shows the ASCII
tape volume label format. A description of
the fields follows the illustration.
Magnetic tape volumes. the volume label
is the first record on the tape. On
nine-track tape it is written in EBCDIC, on
seven-track tape in BCD.
On direct access volumes, it is record
number three, following the two IPL
records. It is recorded as an 84 byte
physical record consisting of a 4 byte key
area containing 'VOLl', and an 80 byte data
area. Both areas are written in EBCDIC.
VOL 379