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This page describes the format and crypto of extdata, "extra data" and StreetPass data stored on [[SD_Filesystem|SD card]].
This page describes the format and crypto of extdata, "extra data" and StreetPass data stored on [[SD_Filesystem|SD card]].
At /Nintendo 3DS/<SomeID>/<SomeID>/extdata/00000000 is directories for each title, with Quota.dat inside each dir. Quota.dat doesn't exist for all titles. Then there's a sub-directory 00000000, which contains the actual extdata. Size and number of files in this dir varies per title.
At /Nintendo 3DS/<SomeID>/<SomeID>/extdata/00000000 is directories for each title. Some titles have Quota.dir is stored in these directories, not all titles use it. Then there's a sub-directory 00000000, which contains the actual extdata. Size and number of files in this dir varies per title.
=== Encryption ===
=== Encryption ===
Most extdata uses the same FS as [[savegames]], except extdata uses [[Savegames|DIFF]] instead of DISA. However some extdata files are raw, without any FS.
Most extdata uses the same FS as [[savegames]], except extdata uses [[Savegames|DIFF]] instead of DISA. However some extdata files are raw, without any FS.
Quota.dat seems to use the same FS and encryption as the actual extdata?
Quota.dat uses the same encryption as extdata, but it's unknown whether data is stored raw or with the FS extdata uses.
'''QUOT'''
'''QUOT'''
* This seems to be stored in the Quota.dat FS image somewhere?
* This seems to be stored in Quota.dat somewhere?
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