With "DriveConnector" for Mac you can mount your ReadyNAS root drive! Once connected you can even create a shortcut to the otherwise hidden and therefore unmountable "PLEX Media Server"-folder located on your ReadyNAS System. With "DriveConnect" it is as easy as it gets to get access to your "PLEX Media Server" Folders!
Mac OS X 10.6 or newer
tested with "ReadyNAS RAIDiator 4.2.24 (x86) on ReadyNAS Ultra 4 & Pro 6