So i just recently picked up a 2008 town and country, and it has a lot of updated features i am unfamiliar with. Playing around with the radio it looks like i got a RER 730N MyGIG. I see a spot for a Nav update, it tells me a version number but i have no way to tell if it is up to date or not, also does the nav update just update the map or does it update the whole radio too? I also see that the radio is supposedly equipped with a hard drive though its vary small. Is this hard drive apart of the radio? or is it a replaceable unit hiding somewhere behind the dash? I got a bunch of SSD's lieing around i could probably clone the disc very easily if it is a seperat piece.