The 'total' is with no downloaded apps (along with their own cache and data), available is what you have left. The rest of it is taken by a whole bunch of sized partitions all filled (or not) with system, logs, data, imei..... different system apps and files that you can't see without going deep into the root. Now if you had the Google Edition i9505G you'd have 13GB total, same device just less bloat and partitioned differently.
So should i be using/or setting my phone up differently with a memory card installed?
I still dont understand it fully but thanks for explaining it

Much better help on here than XDA
