VMS Help MOUNT, Qualifiers, /INITIALIZE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /INITIALIZE=CONTINUATION

    Specifies that any volume added to the magnetic tape volume set
    is initialized before you can write to the volume.

    Example

    The /INITIALIZE=CONTINUATION qualifier instructs the MOUNT
    command to assign its own continuation label. In this case, the
    operator can enter the command REPLY/BLANK=n, and the system
    assigns a label derived from the original. It uses the label
    specified in the MOUNT command and adds the appropriate number
    (ABCD02, ABCD03, and so forth).

    $ MOUNT/INITIALIZE=CONTINUATION MTA0: ABCD