I apologize if this has already been answered, I can't find it using the search function. I know when formatting a disk you don't gain the full capacity of the disk but what I've lost seems a bit large. I have a iPhone 6 64gb SG, when I check under Settings/General/Usage I'm given the amounts of 13.0gb used and 42.6gb available (totaling 55.6gb). Is this normal or possibly a glitch from restoring from my previous iPhone's backup? Thank you for any help!