NL should be specified when a program needs to process unlabeled tapes NL can also be specified when the program wants to create unlabeled TAPE because the system’s default action, in cases when parameter is not specified, will create IBM standard label. Non labeled tapes are often used for sending tapes to another installation. That way you don’t have to worry about the tape label corresponding to the STANDARDS at the other installation or about ACCIDENTALLY matching the volume serial number of an existing tape at the installation.

NL should be specified when a program needs to process unlabeled tapes NL can also be specified when the program wants to create unlabeled tape because the system’s default action, in cases when parameter is not specified, will create IBM standard label. Non labeled tapes are often used for sending tapes to another installation. That way you don’t have to worry about the tape label corresponding to the standards at the other installation or about accidentally matching the volume serial number of an existing tape at the installation.