Hey guys, first-time poster here, using my 13-inch MBA, enjoying it very much. I'd like to ask about using SD just for storage expansion, since I'll be getting close to the limits of my 256 gb if I add much more media to my HD. While I have my external hard drive at home, I am thinking about getting an SD card that I always keep inside my MBA to increase storage space, and perhaps some spares beyond this for the road. Not sure what I'm gonna put on the one that I keep inside the MBA 99% of the time, perhaps my MP3 collection, backups of my aperture library of iphone pics (I'm not a professional) or my collection of scanned documents and books that I plan to put onto an organizational program like Devonthink or calibre for ebooks. Each of these takes up a few dozen gigabytes, or more if I transfer more from my ext HD. I'm not so familiar with SD cards, and the various types and calibres out there, but I figure that if I really want the extra space, it'll be cheaper to get some, rather than paying $750 for a 360gb or $1300 for a 480gb SSD drive from Other World Computing at this point. And I realize that would be more expensive for various reasons, not just space. So, can anyone recommend the biggest possible SD I should get for storage purposes? Beyond size, I'm willing to pay for quality, reliability, and speed, but obviously don't need the type of SD cards meant for professional photographers. Any suggestions I should keep in mind for dealing with 1 of the 3 possibilities above (photos, mp3s for itunes, or scanned documents) if accessing them from an SD card all the time would also be appreciated, but perhaps not necessary if it's not a big deal. Thanks!