I'm having trouble with my /Library folder. When I read it, it says it's 30GB. However, when I go into it and select all of the contained folders, it only reads 5GB!! How is it that there are invisible folders taking up so much space?! Is it normal for the system to create these invisible folders and take up SO MUCH space?! I mean 25GB is inexcusable!! What's going on with my system?