What is the largest capacity microSD (technically microSDXC) card in the market today? If you answered SanDisk’s tiny 400 GB card launched last August, then you’re woefully out of date. Well, just half out of date. UK-based Integral Memory just announced its a microSDHC/XC Class 10 UHS-I card with a whopping 512 GB of storage inside. Only problem for now is that it isn’t available for you to buy just yet. And when it does, be prepared to pay a pretty penny for it.