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==== Directories ====
==== Filesystem structure ====
When extdata is created, these directories are *always* created regardless of whether the title actually uses them.
When extdata is created, these are *always* created regardless of whether the title actually uses them.
User extdata and SpotPass extdata use separate mount points at /user and /boss. Therefore one mount can't access the other directory, and also can't access /icon.(The title's SpotPass extdata can be mounted by the title itself, if it uses SpotPass)
* /icon Presumably contains the icon displayed in data management.
* /icon This file contains the extdata icon displayed in data management. This icon can only be written to by titles when creating extdata, titles would have to recreate extdata to change the icon. Reading this icon isn't done by directly reading the file, this is done by other means.
* /user Presumably contains the title's actual files for "extra data".
* /user Contains the title's actual extdata files.
* /boss Presumably contains content downloaded/transferred via [[SpotPass]] in SD extdata, and in some cases [[StreetPass]] data in NAND extdata possibly.(SD extdata can store StreetPass data but usually NAND extdata is used for that)
* /boss Can contain [[SpotPass]] and possibly [[StreetPass]] content. SpotPass content is *always* stored in SD extdata, while StreetPass content is usually but not always stored in NAND extdata.
=== Info on titles extdata ===
=== Info on titles extdata ===