def startup_disk=(startup_disk_option)
      raise JSS::InvalidDataError, "#{startup_disk_option} is not a valid Startup Disk" unless startup_disk_option.is_a? String
      @reboot_options[:startup_disk] = 'Specify Local Startup Disk'
      self.specify_startup = startup_disk_option
      @need_to_update = true
    end
def startup_disk=(startup_disk_option)
      raise JSS::InvalidDataError, "#{startup_disk_option} is not a valid Startup Disk" unless startup_disk_option.is_a? String
      @reboot_options[:startup_disk] = 'Specify Local Startup Disk'
      self.specify_startup = startup_disk_option
      @need_to_update = true
    end
Set Startup Disk
 Only Supports 'Specify Local Startup Disk' at the moment

 @param startup_disk_option[String]

 @return [void]