I formatted mine in the st16. Now with that being said, that was tricky. That stupid SD slot is so hard to work with. I used a jewelers slot screwdriver to get it in and after fiddling with it for almost 1/2 hour I got it to work. Some people have said they get the card in but can't get it out. You would be better off just format it on a computer and then start shooting and the folders get automatically created on the card.