Once tape-volume security is activated, it remains active across halt/load operations unless it is specifically deactivated. However, if for some reason the system cannot locate the tape volume directory (for example, if the file is on a disk pack that is not online) then during the halt/load sequence, the message “OK TO CREATE VOLUME DIRECTORY” appears on the ODT.

As an alternative, the operator can locate the current volume directory and make it available to the system. The volume directory resides in the catalog file, and its disk family location is controlled with the DL CATALOG form of the DL (Disk Location) system command.