
My iPad just got 2.5G memory left. And keep crashing when I play iTuneU video.
I try to add the files size but it never add up to 54G.
There must be something left unclean inside iPad.
I plan to restore iPad to its default state .
But I try iFunbox

1.Under RAW File System
2.Inside Downloads folder
3.There are many "don't know what it is" folder.
4.I delete 10 , iPad seems ok
5.Ther I delete all files before 2014, iPad seems ok
This is what I got after I delete all before 2014 files

I reclaim almost 20G of free space !!!!
I think these space are fail update App or fail download iTuneU video or fail transfer data between App.
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