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闪存文件系统: Difference between revisions

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===加密===
===加密===
NAND文件系统使用[[AES|AES-CTR]]加密。NAND中TWL region使用TWL NAND的[[AES|keyslot]]，而CTR region使用CTR NAND的[[AES|keyslots]]。CTR NAND分区的 keyslot 是由NCSD分区的磁盘文件系统类型所决定的。每个分区表的NCSD分区加密标志位（TWL keyslot 或 CTR keyslots）这样表示: 0x01=TWL, 0x02=CTR。TWL/CTR NAND region在NCSD头部指定。NAND的前 0x0B100000 byte使用TWL  keyslot加密，在0x00012E00之前则只有MBR分区表使用TWL  keyslot(那个region包括下表所示的TWL分区)。
NAND文件系统使用[[AES|AES-CTR]]加密。NAND中TWL region使用TWL NAND的[[AES|keyslot]]，而CTR region使用CTR NAND的[[AES|keyslots]]。CTR NAND分区的 keyslot 是由NCSD分区的磁盘文件系统类型所决定的。每个分区表的NCSD分区加密标志位（TWL keyslot 或 CTR keyslots）这样表示: 0x01=TWL, 0x02=CTR。TWL/CTR NAND region在NCSD头部指定。NAND的前 0x0B100000 byte使用TWL  keyslot加密，在0x00012E00之前则只有MBR分区表使用TWL  keyslot(那个region包括下表所示的TWL分区)。
 
Note that re-encrypting a NAND image alone from another 3DS for use on a different 3DS is not enough to use that NAND image on a different 3DS: certain files in the "nand" partition would need modified/replaced as well.
切记，一台3DS重加密的NAND镜像，不能直接给另一台3DS使用，“NAND”分区的某些文件也需要修改/更换。


===NAND结构===
===NAND结构===
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|   
|   
|  0x0B100000
|  0x0B100000
|  0x00
|  0x00030000
|  0x00030000
|  0x04
|  0x04
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==== 0x4000 ====
==== 0x4000 ====
On some 3DS systems(such as 3DS XL), there's a plaintext FAT16 boot record located at NAND offset 0x4000. This block does not exist for launch-day 3DS systems. This is the only plaintext block for this "partition".
某些3DS系统（比如3DS XL）,有一个明文的FAT16引导记录在NAND偏移的0x4000位置。这个块在launch-day 3DS的系统里是不存在的。在这个“分区”内只有明文的块。


=CTR分区=
=CTR分区=
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  ├── [[nandrw/shared|shared]]
  ├── [[nandrw/shared|shared]]
  └── [[nandrw/sys|sys]]
  └── [[nandrw/sys|sys]]
     ├── [[nandrw/sys/lgy.log|lgy.log]] (This is written to by [[FIRM|TWL_FIRM]] when errors occur, this is equivalent to native.log)
     ├── [[nandrw/sys/lgy.log|lgy.log]] (发生错误时由[[FIRM|TWL_FIRM]]记录，是与native.log等效的)
     ├── [[nandrw/sys/LocalFriendCodeSeed_B|LocalFriendCodeSeed_B]]
     ├── [[nandrw/sys/LocalFriendCodeSeed_B|LocalFriendCodeSeed_B]]
     ├── [[nandrw/sys/native.log|native.log]] (This is written to by [[ErrDisp]])
     ├── [[nandrw/sys/native.log|native.log]] (This is written to by [[ErrDisp]])
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  ├── [[nand/ro|ro]]
  ├── [[nand/ro|ro]]
  ├── [[nand/rw|rw]]
  ├── [[nand/rw|rw]]
  ├── [[nand/ticket|ticket]] (This directory is empty since tickets are stored in [[Title Database|ticket.db]])
  ├── [[nand/ticket|ticket]] (自ticket存放到[[Title Database|ticket.db]]后，这个目录就是空的了)
  ├── [[Title Data Structure|title]]
  ├── [[Title Data Structure|title]]
  └── [[nand/tmp|tmp]] (This is usually empty, even when installation for a system update still needs [[AMNet:FinishInstallToMedia|finalized]])
  └── [[nand/tmp|tmp]] (这个通常是空的， even when installation for a system update still needs [[AMNet:FinishInstallToMedia|finalized]])




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