.3ds/.3dz files go on the mSD in the gateway card, root directory although it may be possible to folder them now, not sure. Sorry can't link to any or you will ban me.
Launcher.dat goes in root of the SD and must be formatted to FAT32. It is recommended to format the mSD to exFAT.
The card 1 saves will end up on the SD as xxxx.sav
Thanks I appreciate your help. So you are saying the only thing that needs to be on that micro sd are 3DS roms? (thanks for not linking to any, I have plenty of places to get them haha). So what, does the Gateway only need the internet exploit and the launcher.dat to work?
I am used to DS flashcarts where its my job to create the folders and provide the flashcart with its necessary OS and data files.