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There are two known specialisations of the NCSD container format. The CTR Cart Image (CCI) format and the CTR System Update (CSU). CCI is the format of retail game ROM dumps. CSU is used with developer system updates and tools
There are two known specialisations of the NCSD container format. The CTR Cart Image (CCI) format and the CTR System Update (CSU). CCI is the format of retail game ROM dumps. CSU is used with developer system updates and tools
NCSD images start with a NCSD header, followed by up to a maximum of 8 [[NCCH]] partitions. The first partition([[NCCH]] 0) usually starts at 0x4000, this is generally the main [[NCCH#CXI|NCCH]] (Executable). The following info on partitions 1, 2, and 7 are only valid for .CCI. The second partition([[NCCH]] 1) contains the game's Electronic Manual(title ID for the .[[NCCH#CFA|CFA]] containing the Electronic Manual always starts with '0005'). The third partition([[NCCH]] 2) contains the download play "Child"(The title ID for the .[[NCCH#CFA|CFA]] containing the DLP Child always starts with '0006'). The eighth block([[NCCH]] 7) contains "Update Data"(The title ID for the .[[NCCH#CFA|CFA]] containing the Update Data always starts with '8000') The format of partitions can be determined from the partition FS flags, while the contents can be determined from the partitions flags.
NCSD images start with a NCSD header, followed by up to a maximum of 8 [[NCCH]] partitions. The first partition([[NCCH]] 0) usually starts at 0x4000, this is generally the main [[NCCH#CXI|NCCH]] (Executable). The following info on partitions 1, 2, and 7 are only valid for .CCI. The second partition([[NCCH]] 1) contains the game's Electronic Manual(The partitionID-high for the Instruction Manual .[[NCCH#CFA|CFA]] is always 0x00050000). The third partition([[NCCH]] 2) contains the download play "Child"(The partitionID-high for the .[[NCCH#CFA|CFA]] containing the DLP Child is always 0x00060000). The eighth block([[NCCH]] 7) contains "Update Data"(The partitionID-high for the .[[NCCH#CFA|CFA]] containing the Update Data is always 0x80000000). The format of partitions can be determined from the partition FS flags, while the contents can be determined from the partitions flags.
== NCSD header ==
== NCSD header ==
|}
|}
=== Partition Flags ===
{| class="wikitable" border="1"
|-
! Byte Index
! Description
|-
| 3
| This flag can determine how the gamecard savegame keyY is generated when set, it's unknown if this flag is used for anything else.
|-
| 7
| This flag can determine how the gamecard savegame keyY is generated when set. All games since [[2.2.0-4]] have this flag set, this flag likely also enables the new CTR method as well.
|}
== Card Info Header ==
== Card Info Header ==