I've got a Mid 2012 15 inch Retina MBP (2.6 Ghz I7, 500GB SSD) that I use for work. The SSD was filling up a bit and I'm trying to trim it down a bit by deleting/moving off files. I have a question I'm hoping someone can help me answer. When I look at Disk Utility, it says that I have 235GB of available space (in the grid portion of the screen), but in the top portion of the screen where it breaks it out between apps, photo's, audio, etc..., it says I only have 160GB available. When I open up "DaisyDisk" (app) it says that I've got 339GB used (i.e. roughly 160GB available). I'm just curious why the difference between what Disk Utility states as available space (i.e. in the grid section) versus what it states in the "upper section" and what DaisyDisk claims.