Default [HELP] Strange storage problems

Hello, I know obviously my 16GB has only 13GB available for myself to use because three gig or so is taken up by the rom and such. However, on closer inspection, I don't actually seem to be getting that. I was looking at my storage earlier and I seem to be missing nearly three gig from the slightly less then 13gb that I have available. I just wondered if maybe you guys could shed some light on this for me, I appreciate any help you guys can offer, thanks in advance. Don't hesitate to ask for more info.

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