existing applications can run unchanged in a mobile device and call the security module embedded in the SD memory just as if it was a regular sized smart card inserted in a USB card reader ...

It allows the Arduino board to appear as a USB drive, and files can simply be dragged and dropped into place. The library can set up to use SPI flash, SD cards, or even internal chip memory as the ...

Much like a Gameboy, you could put in a range of modules, ranging from games to cameras to memory expansion and ... a way to get an SPI device like an SD card to communicate and expand storage.