How to DSiWare for SD Card Manual Install find an option to save the DSiWare game directly to the SD card from the DSi Shop. Also, as dot_hack_freak mentioned above, from the "System Settings" > "Data Management" section you can copy downloaded games to and from the SD card. However, it does appear to work as expected: I copied "AQUIA" to the SD card, and deleted it from the system memory (NOTE: Unlike on the Wii, a "Move" option is not present). After doing so, "AQUIA" does not show up in the main menu - even after a re-boot. I copied "AQUIA" back to the internal system memory, and the game is now back in the main menu. Conclusion: SD card support in the current DSi firmware (v1.3U) or (v1.3J) does not appear to be as fully implemented as it now is on the Wii. [EDIT] I took a few pictures and copied "AQUIA" back over to the SD card slot. I did not see any way to get audio recordings onto the SD card. The directory structure on the SD card is as follows: root/DCIM/100NIN02/ - Image files are stored here. - Naming scheme: HNI_000#.JPG root/private/ds/app/[random_8-digit_hexidecimal_number]/ - Purpose unknown - One file contained: pit.bin - 47 kb root/private/ds/app/title/ - Purpose unknown - Two files contained: [random_8-digit_hexidecimal_number].bin - 11,580 kb HNB_.lst - 2 kb They're saved in .bin format on the SD card in \private\ds\title, along with a single .lst file. They're named along the lines of 4B4D394A.bin, 4B4D464A.bin etc. up to 484E474A.bin. The .lst file is HNB_.lst. There's also a \private\ds\app folder, which contains a folder \484E494A, which contains pit.bin. Possibly browser settings? It hasn't been modified in a few days, so nothing to do with DSiWare. Also, when copying the browser and Moving Notebook over to the SD card, you get a warning that not all data may be transferable. No explanation given on this one.