wild idea you put 16GB of DRAM as cache. maybe use registered memory or something to run in from a single channel. well a 16GB ddr3 stick is expensive but I'm not the engineer trying to work that out
. or a regular 8GB stick is incredibly affordable already compared to not long ago.
it can be filled in three minutes from a HDD, so you load up your game, start playing it after a short enough waiting time, but the game continues loading GB after GB of content starting with the most local, relevant one and when hard disk grinding is done, you can explore the game with no pop in ever even if you use a horse, vehicle, fast turning speed etc.
and fast forward a few kilometers away by pointing at the map rather than manually riding your horse on the way etc. and not having to refill your cache, as it's got all the content already
.
it's just a variation on the SSD but, where are our small and fast and cheap SSD? it
may be that needing multiple flash chips to get good enough transfer rates put a floor price on SSD as well. so far cheapest SSD and cheapest HDD are the same price. but time may prove me wrong on this.