To verify a disk, simply launch Disk Utility (found in Applications > Utilities), click on the drive volume you wish to check, then click on the First Aid button in the Disk Utility toolbar. It does this by “freezing” the volume, so while you’re running the verification tests you may find that your Mac becomes slow or unresponsive. This means that Disk Utility can check the status of a disk, its catalog file, multi-linked files, catalog hierarchy and more the Mac needing to be started up with another disk drive. Verifying a disk subjects it to a series of checks, all of which are done through a process called “Live Verification”. An external device doesn’t work properly.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.
