I looked at the info of a folder with more small files and it showed 1000 MB. I found a big folder of 500MB and I moved it in another location. Then I looked inside and I sorted by size, and the greater file size being 12MB. I calculated the sizes of the folders and the big ones together make 200MB. I also looked with pathfinder and no big size invisible files. I emptied recycle bin. I cant find out why the file of the enclosing folder shows 1000MB ?