IBM 1130 User Manual page 464

DISK CARTRIDGE ID CHECKING
A second assist given you by the Monitor system is
the checking of disk cartridge ID numbers. Every
cartridge must have an ID number; if you so desire,
you can request that the Monitor check each car-
tridge for a certain ID and alert you if the desired
cartridges are not mounted.
Section Subsections Page
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For example, suppose you have placed a payroll
data file on a particular cartridge, and have identi-
fied it as cartridge 6066. If you punch 6066 in col-
umns 11 through 14 of the JOB card, the Monitor
will read the cartridge ID from the disk on logical
drive 0, and, if
it
is not 6066, you will be so in-
formed with a message.
If you don't care which cartridge is mounted (or,
more likely, if you will check
it
yourself), those
columns on the JOB card may be left blank.