Système de fichier de la carte SD

La 3DS utilise une carte SD pour le stockage des données additionnelles des jeux, la musiques et les photos prises avec la 3DS.

/DCIM - Photos et images téléchargées avec le navigateur Internet.
/Music - Fichiers de musique
/Nintendo 3DS - Données des jeux

/DCIM depuis la mise à jour 3.0.0-5 contient aussi les vidéos 3D .avi de l’Appareil Photo 3DS. Le codec utilisé est MJPG.

Données additionnelles

Les données additionnelles des jeux sont stockées ici:

/Nintendo 3DS/<SomeID>/<SomeID>/extdata/00000000

0000008f - Quelques données du firmware 2.0.0-2, inconnu (n’apparaît pas dans le management des données additionnelles) 
00000098 - eShop - EUR (Non confirmé)
00000207 - Editeur Mii - JPN 
0000020d - La Guerre des têtes - JPN
00000210 - Quelques données du firmware 2.0.0-2, inconnu (n’apparaît pas dans le management des données additionnelles) 
00000217 - Editeur Mii - USA
00000219 - eShop USA
0000021d - La Guerre des têtes- USA
00000227 - Editeur Mii - EUR
0000022d - La Guerre des têtes - EUR
0000030c - Nintendogs + Cats - EUR
00000326 - Pokédex 3D - EUR
0000032d - Super Street Fighter IV 3D - USA
0000033b - Ridge Racer 3D - EUR
0000033c - Super Street Fighter IV 3D - EUR
0000034d - Samurai Warriors Chronicles - USA
00000358 - Ridge Racer 3D - USA
0000038a - Dead or Alive Dimensions - EUR
000004aa - Nintendo Vidéo - USA
000004ab - Nintendo Vidéo - EUR

Toutes les données additionnelles ( Données additionnelles//FR), sont cryptées. Même si ces fichiers utilisent des blocs 0xFF similaires aux Sauvegardes de Jeux FLASH, ils ne peuvent pas être décryptés avec la faille xorpad comme les sauvegardes.e. Les données additionnelles ne peuvent pas être copiée sur la carte SD d'une autre 3DS, elles sont liées à la console.

import.db and title.db

With the introduction of the June update the folder structure changed slightly. You will now find "dbs" and "title" folders located in /Nintendo 3DS/<SomeID>/<SomeID>/ along with the extdata folder. "dbs" contains two files, import.db and title.db - usage currently unknown. import.db seems to contain data from DSiWare SRLs.

The data at the beginning of the file is encrypted, but the rest is cleartext. This file is always 3.1MB, thus this doesn't contain the whole SRL for most DSiWare. The data stored here is not ordered the same way as the src SRL: ARM7 code, ARM9 code, and data are mixed together. The file can contain data from DSiWare that wasn't installed, only listed on the src DSi for DSiWare transfer. (This file is likely some temporary data storage used for DSiWare install etc).

title.db seems to be encrypted.

• Old and new import.db and title.db xored, revealing some plaintext.

title

/title/00040000/ Contains eshop downloads (can someone verify these and add for different regions?):
00032600 - Pokedex 3D - EUR (verified)
00042a00 - Legend of Zelda - Link's Awakening - EUR
0004ab00 - Nintendo Video - EUR
00052000 - Let's Golf 3D - EUR
00054300 - 3D Classics Excitebike - USA
00054e00 - 3D Classics Excitebike - EUR (verified)
00054300 - 3D Classics Excitebike - USA
00045C00 - 3D Classics Excitebike - JPN
For more IDs, see the 00040000 titles on the Title_list.

The above title directories contain two dirs: content and data. content contains 00000000.tmd, .app files, and some cmd dir containing 00000001.cmd, all of which are encrypted with a console-unique key. The data dir contains 00000001.sav, this is the title's encrypted savegame. Although these saves look similar to FLASH savegames, these savegames use proper unique CTR for each AES block in the file, and the CTR properly changes for each savegame write. Renaming these savegames causes home-menu to hang while launching titles, modifying saves throws the usual checksum/hash corruption like gamecard flash saves.

When renaming any of these files/dir under content, the icon in home-menu is still displayed. Modifying any of these files has same result as renaming them. When renaming the cmd dir/cmd file, or 00000000.app, the 3D banner isn't displayed. When renaming the cmd dir or the file contained in that dir, home-menu will refuse to run the title, and the manual will not work.(will display the black screen saying sdcard isn't inserted) Manual won't load when 00000001.app is renamed, so that .app might be the manual? When the main 00000000.app binary is renamed, the title will not launch and in the manual placeholder text is used for the title name/icon. Home-menu doesn't care at all when tmd is renamed.

Private

"Private" data is stored here:

/Nintendo 3DS/Private/<Title ID Low>/

00020400 - Nintendo 3DS Camera 
00020500 - Nintendo 3DS Sound

"Private" data for 3DS Sound/Camera are cleartext. Under the camera priv dir is phtcache.bin, this seems to list the pictures on SD card? When you want to intall pictures and see it with 3DS,rename to 8 numbers.mpo and save it on /DCIM . Under the sound priv dir is: voice/XX/*.m4a. Where XX is 01-10, with sound saved as .m4a.