A:Answer There is a single temperature control for both the fridge and freezer, so they cannot be turned off separately. (If you're worried about the food in your fridge spoiling, you could perhaps put some freeze packs or bags of ice in the fridge while you're defrosting?)
The good news is that you shouldn't need to defrost very often; I've had mine running for about a month now on the recommended setting and there isn't any trace of frost yet.
The interior freezer dimensions are roughly 13" wide, 13" deep, and 11" high (big enough for a couple full-size frozen pizzas, plus desserts and ice trays!)