Verifying a disk subjects it to a series of checks, all of which are done through a process called “Live Verification”.
Some of the issues you might encounter that indicate a disk that might need repair: This can be useful if you’re running into odd issues with a Mac, so we’ll take a look at the process of verifying and repairing disks with macOS Sierra’s Disk Utility. The updated app now presents a streamlined appearance while retaining all of its former functionality, and it’s still useful for verifying or repairing disks. One of the old Mac OS X utilities, Disk Utility, has received a makeover in macOS Sierra.
