
The root filesystem does not fill the entire flash.
You can access the remaining storage by formatting partition 1 (mmcblk0p1)
The easy way to do this is by installing gnome-disk-utility from a terminal:
sudo apt-get install gnome-disk-utility
Then run it:
gnome-disks
Then click on the last partition (the unknown one with the most space) and click on the icon with the two cogs below.
Select format from the menu
Select 'don't erase' and 'ext4 filesystem', enter a name for the partiton and hit format.
Once it's done, reboot the system and the new partition will be mounted.
Sent from my iPhone using Tapatalk