I have Yosemite on MacBook Air and continuously get en error about storage usage. It keeps saying there isn't enough empty space on disk. About this Mac says that I have 65.96GB of other type files. When I get info about home directory it says 57.69GB is the size of home directory. However when I sum up the sizes of each directory under home, it is only about 12GB of data. I can't find where the remaining 46GB is. Any ideas?