[Q] Missing hard disk space?

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http://forum.xda-developers.com – i dont know if you guys encountered this... but i recently moved a movie into my gnex to watch. after watching, i deleted it. after deleting, i tried to move a new movie in. but, it said i didnt have enough hard disk space. strangely enough, the new movie is smaller than the old movie i deleted, so i was a bit confused. i checked my disk space usage app and my system data ballooned to almost double. what happened? can anyone shed some light on this? thanks. (HowTos)