Along with a data set name, you can optionally specify a volume serial. If you do, the system catalog is not used. For example:

Volume Serial . . . ______    (If not cataloged)

Volume Serial

A real DASD volume or a virtual volume residing on an IBM® 3850 Mass Storage System. To access 3850 virtual volumes, you need MOUNT authority, which is acquired through the TSO ACCOUNT command or the RACF® TSO AUTH CLASS command.