I currently have a 1TB USB 2.0 Buffalo external HDD which is almost full. It's great, but I need more space. Also, I transfer back and forth quite a bit so sometimes that can be a bit slow. I've been thinking about getting a 64GB SDXC card as a kind of permanent resident in my MBPr (2.3/8/256 model), to boost the storage. I would keep files I wouldn't cry over should I ever lose it. My question is is this a viable option? Do any of you also do this? The benefit I would see is that it is always "part" of my laptop, as opposed to an external drive which means moving it around with my laptop. I think I will end up getting a 1TB USB 3.0 Buffalo anyway as I think they're great and I could do with some extra storage. I wonder if I should just skip the SDXC (if not viable) as they are similar prices.