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On my "8GB" device (which I believe doesn't have an extra physical sdcard installed (I have to unscrew it to see that)) I have the following df output:

Filesystem             Size   Used   Free   Blksize
/dev                   402M    32K   401M   4096
/mnt/secure            402M     0K   402M   4096
/mnt/asec              402M     0K   402M   4096
/mnt/obb               402M     0K   402M   4096
/mnt/shm              1024K     0K  1024K   4096
/system                503M   297M   206M   4096
/data                    6G   344M     5G   4096
/cache                 495M   186M   309M   1024
/device                  7M     1M     6M   1024
/storage/sdcard0         6G   344M     5G   4096

I am confused though, because /data and /storage/sdcard0 are exactly the same (suspiciously the same!), but as I understand it though: /storage/sdcard0 should refer to an external physical sd-card, and not refer to the same place as /data. What is going on?

JohnyTex
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    For device without external physical storage, /storage/sdcard/ still refers to external storage, but it's emulated. This question might be helpful, or even it might be a duplicate. – Andrew T. Jun 24 '15 at 09:37
  • But then it should mount under /storage/emulated/ or something, no? – JohnyTex Jun 24 '15 at 09:38
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    On my Nexus 7, /storage/sdcard0 is a symlink to /storage/emulated/0. Your device probably has something similar. I don't think the exact mountpoint matters (i.e sdcard0 vs emulated/0), as long as they all point to the expected location. – keepcalm Jun 24 '15 at 12:33

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