/SYSTEM_ALIAS=alias
       /NOSYSTEM_ALIAS (default)

    This qualifier selects the device name alias to be used for
    references to a directly-accessed partition file, and sets
    the partition name to SYS$LOADABLE_IMAGES:SYS$EFI.SYS or
    SYS$MAINTENANCE:SYS$DIAGNOSTICS.SYS.

    When this qualifier is specified, the device name parameter is
    ignored.

    This qualifier is otherwise similar to /DEVICE_ALIAS.