On the userdata partition you can install apps, on user you can copy normal files.
Then the Android OS also uses about 1-2GB storage.
And the 16GB is rounded off, so it might only be 15-15.5 GB real storage, there are apps to check this.
On Amlogic tv boxes there is for instance only 1.7GB real RAM instead of 2GB.
This is not a issue on Rockchip devices as there are real 1.99GB RAM.
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