I recommend the LaCie Rugg

I recommend the LaCie Rugged. I’ve used them all over the world, in extreme environments (hurricanes, war zones) and never had a hiccup. They’re MIL-Spec (MIL-STD-810), USB-powered, extremely portable, and pretty much the gold standard for traveling journalists.

I’ve seen them at Apple stores, or:

http://www.bhphotovideo.com/c/product/558882-REG/LaCie_301371_500GB_Rugged_Triple_Interface.html

I believe they have a 1T model out now.