Originally Posted by
vivekgiri_7 Keep calm....
Those 600 mb data are yours WhatsApp backup files and other downloaded files by this party browser (like UC), in your SD card.
Are you kidding me? 600MB for WhatsApp backup? What so special and giant in WhatsApp? And talking about UC browser, I prefer downloading files to directly to SD card but still I have the same issue with phone storage. It's really nothing else but just junk files.
I tried to open a zip file and it was about 500MB in size. It failed to open but 500MB of my phone storage was filled with junk shown in other files. It can't be WhatsApp!
Microsoft has left some bugs in Windows phones to bother us. And good news is that now when Windows 10 is released, there'd be no update for WP 8.1 users.