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===Encryption===
===Encryption===
The NAND file system is encrypted using AES-CTR. The TWL regions of NAND use the TWL NAND [[AES|keyslot]], while the CTR regions use the CTR NAND [[AES|keyslots]]. The keyslot used for CTR-NAND partitions is determined by the NCSD partition FS type. The TWL/CTR NAND regions are specified by the NCSD header. The first 0x0B100000 bytes of NAND is encrypted with the TWL keyslot, however before 0x00012E00 only the MBR partition table is encrypted with the TWL keyslot. That region contains the TWL partitions listed below.
The NAND file system is encrypted using AES-CTR. The TWL regions of NAND use the TWL NAND [[AES|keyslot]], while the CTR regions use the CTR NAND [[AES|keyslots]]. The keyslot used for CTR-NAND partitions is determined by the NCSD partition FS type. The TWL/CTR NAND regions are specified by the NCSD header. The NCSD partition encryption flag for each partition indicates whether the TWL keyslot or the CTR keyslots are used for encryption: 0x01=TWL, 0x02=CTR. The first 0x0B100000 bytes of NAND is encrypted with the TWL keyslot, however before 0x00012E00 only the MBR partition table is encrypted with the TWL keyslot. That region contains the TWL partitions listed below.
===NAND structure===
===NAND structure===
! Size
! Size
! NCSD partition FS type
! NCSD partition FS type
! NCSD partition index
! Description
! Description
|-
|-
| 0x200
| 0x200
|
|
|
| NCSD header, this contains the offsets/sizes of the below CTR-NAND partitions. This block also contains the TWL-NAND MBR partition table.
| NCSD header, this contains the offsets/sizes of the below CTR-NAND partitions. This block also contains the TWL-NAND MBR partition table.
|-
|
| 0x00000000
| 0x0B100000
| 0x1
| 0x00
| TWL NAND region
|-
|-
| twln
| twln
| 0x08FB5200
| 0x08FB5200
|
|
|
| TWL-NAND FAT16 File System. (DSi)
| TWL-NAND FAT16 File System. (DSi)
|-
|-
| 0x020B6600
| 0x020B6600
|
|
|
| TWL-NAND PHOTO FAT12 File System. (DSi)
| TWL-NAND PHOTO FAT12 File System. (DSi)
|-
|-
| 0x00030000
| 0x00030000
| 0x04
| 0x04
| 0x01
| By default this partition is empty(only contains 0x00/0xFF bytes since it was never written to), when AGB_FIRM was never launched. This contains the AGB_FIRM GBA savegame.
| By default this partition is empty(only contains 0x00/0xFF bytes since it was never written to), when AGB_FIRM was never launched. This contains the AGB_FIRM GBA savegame.
|-
|-
| 0x00400000
| 0x00400000
| 0x03
| 0x03
| 0x02
| [[FIRM|Firmware]] partition.
| [[FIRM|Firmware]] partition.
|-
|-
| 0x0B530000
| 0x0B530000
| 0x00400000
| 0x00400000
| 0x03
| 0x03
| 0x03
| [[FIRM|Firmware]] partition.(Backup partition, same as above)
| [[FIRM|Firmware]] partition.(Backup partition, same as above)
| 0x2F5D0000
| 0x2F5D0000
| 0x01
| 0x01
| 0x04
| CTR-NAND partition. (3DS)
| CTR-NAND partition. (3DS)
|-
|-
| 0x0B95CA00
| 0x0B95CA00
| 0x2F3E3600
| 0x2F3E3600
|
|
|
| CTR-NAND FAT16 File System.
| CTR-NAND FAT16 File System.