Type III C lass A Program

eadable but not CMS=T-DISK., the disk is not logged in. If
the label is not readable, an automatic FORMAT T (NOTYPE) is
issued.
C-LISK. The C disk's (19C) special usage lies in its ability
to be a read-only extension of the system disk by means of a
modification to the system at installation time. Thus. if
the S disk is full and additional routines are needed as
part of the system, they may be placed on the C disk. For
example. the C disk could contain an old version of the CMS
system disk. Thus it's routines would be used only if they
were not present on the more recent system disk.
Formatting disks. The very first time a user logs in to CMS,
he should issue a FORMAT command to format his disk areas
into the CMS format. For details on FORMAT, see the CMS
FORMAT command.
42 File Conventions