SuperCard MiniSD
From Dev-Scene
The SuperCard MiniSD is a cartridge designed for the GameBoy Advance that uses a slightly rare mini SD card for storage (as opposed to a micro SD card). It is compatible with the NDS and (with Superkey and SuperPass software) can launch NDS ROM files from the mini SD card.
The SuperCard MiniSD uses the FAT filesystem format, and it is capable of loading games to RAM or streaming from the card for execution.