Thinking of getting an Ipad to replace carrying a laptop on trips. My usual workflow is to shoot in Raw then download to laptop (using CF cards) and delete duplicates, minor editing (exposure, white balance, cropping, resizing for email). First: does the Ipad work with an external HDD? I can easily shoot 4 gb of pictures/day. So even with a 64gb Ipad at some point I would need to transfer pictures to a portable HDD. I'm frequently in areas without wifi or cellular coverage so "the cloud" won't really help. Is anyone doing this or similar? Or will the Ipad allow me to do this? Thanks.