VMS Help SET, MAGTAPE, Examples  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    1.$ MOUNT MTB1:/FOREIGN
      $ SET MAGTAPE MTB1: /DENSITY=800

      The MOUNT command in this example mounts a foreign tape on the
      device MTB1. The SET MAGTAPE command defines the density for
      writing the magnetic tape at 800 bpi.

    2.$ MOUNT MTA0:/FOREIGN
      $ SET MAGTAPE MTA0:/SKIP=FILES:4

      The MOUNT command in this example mounts a foreign tape on the
      device MTA0; the SET MAGTAPE command directs the magnetic tape
      position to skip four files.