Disk Utility has stayed more or less the same for years, but Apple has given the Mac power user’s much-loved maintenance tool a big overhaul in El Capitan, making it look difference and removing familiar tools, including the popular ‘Repair Permissions’ command.
Gone is the box-like Disk Utility of yesterday to be replaced by a more colorful edition providing at-a-glance information of how you use your disk.
This means you can see just how much of your Mac is consumed by Apps (blue), Photos (red), Audio (orange), Movies (green), and everything else, aka “Other” (yellow). You can also see how much (or, in my case, how little) space is free (white). This is pretty much the same view as you’ll find in About this Mac under the Storage pane.