The newest and most exciting products to hit the NDS and NDSi systems are Flash Carts.

Flash Carts are just like regular NDS/NDSi carts, except they have either re-writable memory in them, or are capable of storing information on an external memory card - the operation is similar to flash cards used in digital cameras. Using your computer you can transfer information to the cartridge/memory such as programs, eBooks, pictures, and other tools and run them on your NDS or NDSi.
　

Using a GBA/NDS/NDSi Flash Cart

Using a NDS/NDSi slot-1 Flash Cart is easy and generally involves a three step process.

• Connect your microSD flash memory to your computer.
  　
• Using your PC Drag and Drop the slot-1 system menu files, and any other programs/tools/game files, to your microSD memory card.
  　
• Place your microSD memory card in your slot-1 flash cart and enjoy.
  　

These are the basic steps, you should ALWAYS read the manual before operating any software or Flash Cart.