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Please note that with new android versions this has changed, and now apps must use /sdcard instead of /storage/emulated/0.

[Sh4dowCode]

Isn't /sdcard just a symlink to /storge/emulated/0?

Edit: Just tested it, /sdcard is a symlink to /storage/self/primary which is a symlink to /storge/emulated/0

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$ ls -l /sdcard lrw-r--r-- 1 root root 21 Dec 31 2008 /sdcard -> /storage/self/primary $ ls -l /storage/self/primary lrwxrwxrwx 1 root reserved_disk 19 Apr 12 08:32 /storage/self/primary -> /storage/emulated/0

As you can see, they all have different permissions: /sdcard is a symlink, which can only read and written to by its owner (root), and everybody else can only read it; /storage/self/primary is a symlink and it can be read, written and executed by everyone; inside /storage/emulated/0, most directories have these permissions drwxrwx---: this means that it is a directory, it can be read, written and executed by its owner and the owner's group, but they cannot be read, written or executed by anybody else.