Android 4.2 Storage Structure

4.1

../mnt/sdcard

../sdcard

../storage/sdcard0 <

4.2

../mnt/sdcard

../sdcard

../storage/emulated/0 <

../storage/emulated/legacy

../storage/sdcard0

multi-user 관련 업데이트로 structure 가 바뀜

각 symbolic 폴더 같은데, actual 폴더 찾기는 귀찮구나.