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

       /LABEL (default)
       /NOLABEL

    Indicates that the volume is in the standard format used by the
    OpenVMS operating system; that is, a magnetic tape volume is in
    the standard ANSI format, or a disk volume is in Files-11 format.

    The default is /LABEL.

    Note that /NOLABEL is equivalent to /FOREIGN; they both set the
    FOREIGN flag.

    Example

    The following command mounts an ANSI-labeled magnetic tape on
    MFA1 and assigns the logical name TAPE:

    $ MOUNT/LABEL MFA1: TAPE