def specify_startup=(startup_volume)
      raise JSS::InvalidDataError, "#{startup_volume} is not a valid Startup Disk" unless startup_volume.is_a? String
      @reboot_options[:specify_startup] = startup_volume
      @need_to_update = true
    end
def specify_startup=(startup_volume)
      raise JSS::InvalidDataError, "#{startup_volume} is not a valid Startup Disk" unless startup_volume.is_a? String
      @reboot_options[:specify_startup] = startup_volume
      @need_to_update = true
    end
Specify Startup Volume
 Only Supports "Specify Local Startup Disk"

 @param startup_volume[String] a Volume to reboot to

 @return [void]