Chances are you have a handful of SD and microSD memory cards kicking around in a drawer or installed in a variety of devices. And chances are they’re pretty low capacity, like 4GB or maybe 16GB. That was plenty of storage a few years ago, but now? Not so much. High capacity SD cards like Lexar’s new 200GB microSD card are becoming much more common. But when do you actually need a really big SD memory card?