In an earlier post I was worried about my diminishing 3Gb available space (on my 16 Gb ipad 5, ios8). Well today the iPad froze when I shut it down, only the apple logo displayed. Call to Apple and guided through a restore from iTunes (glad I backed it up before doing ios8). BUT THE POINT, I now have 6.4 Gb available with all the apps and data and photos restored vs prior the 3.1 Gb. So the Ipad obviously does fragment or otherwise cordon off memory that is useable. It would seem that periodic defragging would be in order for iPads OR why the increased free memory??? Meanwhile the pressure to buy a 32Gb device is down. WHY, how to defrag, or should one somehow force periodic 'restores' ??