I know it might seem confusing, but there's good reason for that internal sd un-mount.
The un-mount option isn't just for physically removing the card. It is also needed if you want to remount the internal memory differently. The partition that this option affects is the user storage, it's the partition that your computer needs to mount in order to let you transfer files to your Vox. When you connect to your computer and select "turn on usb storage" your Vox in-mounts that partition of the internal SD card and your computer mounts it. It gives the user the option to do this (even when not connected to a computer) as well simply because of the way android is built.
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