There are three storage notes on System Panel: Memory, Internal Storage (6661.8 M available) , and SD Card (7681.2 M available). Memory says 71% used (and 117.6 M available) or 29% free. What does this mean? I don't even have anything open except for Lookout in the background (antivirus and backup disabled) and System Panel on. If it's ROM, how could I be using 71% doing practically nothing?