Disk Utility has a new, more approachable look, though features such as writing a disk image or folder to a CD or DVD have been dropped.
64> Its left-hand pane now categorises disks as internal, external and disk images, reducing the chance you’ll mistake, say, an SD card and a USB flash drive of the same size and erase the wrong one.
65> The right-hand pane is now purely informational, showing details of whatever you’ve selected on the left in a colour-coded breakdown of its contents, much like the one for iPods and iOS devices connected to iTunes.
Operations are now invoked solely from button in the toolbar. Some will be greyed out, indicating they’re not applicable to your selection on the left. 66> First Aid is equivalent to Repair Disk in older versions, checking for low-level structural issues. The option to repair permissions is gone because El Capitan is supposed to check and repair them silently for you.
67> The Partition feature now shows a disk’s structure as a pie chart. The order of partitions on a disk starts from top-centre and works clockwise around the chart. When partitioning a disk, the app will split whichever is selected (blue after you click it) when you click the + button.
68> If you need to restore the contents of a disk from an image, or another drive, that option is still available – but in the Edit menu, not Images.