Convert Internal Storage to Phone Storage
I'm not saying this for sure ! But as far as i had checked the partitioning topics and also in my own experience i'd dived into actions about that .

i do not recommend you delete a partition completely , Because first of all it may cause an error so you can safely reduce it's size to very low &amp; keeping that tiny space for the system presentations and checks (android checks much much things that we can't even guess those are counted as an important thing for the system to run) . 
I'm not a pro at all Just hoped to be usefull :)