Nintendo DS Flash SD Card, GBA Games not working

However, it also has an SD card slot for cheaper storage What I Nintendo DS : Video > High Resolution 3D Rendering > ON

Slot 2 is on the bottum part of the ds and thats where you insert your gba games Slot 1--> Nintendo ds games -smal Slot 2--> Gameboy advance

ds lite gba slot My goal is to reverse engineer the protocol, but I have no idea where to even start Specifically: How does the DS game know which GBA game is

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