![]() If the utility finds any irregularities then you'll need to start the Mac up from another volume – such as a Mac OS X install DVD – enter macOS Recovery, or start up from Internet Recovery and run Disk Utility to repair the disk. Live Verification works only on MacOS X Extended (Journaled)-formatted (HFS+J) volumes, so if you are trying to verify other volumes then it will only display an error message. ![]() Thanks to its “Live Verification” feature, Disk Utility can be used to check the Mac's startup disk without starting the computer from another volume. Using Disk Utility to Repair a Startup Disk To do that macOS has two powerful utilities: the more user-friendly Disk Utility (which has a nice GUI) and fsck (short for File System Consistency Check), a command-line utility which is only recommended for advanced users comfortable with controlling a Mac using text commands. Especially now that Apple has migrated its user base over to its new Apple File System (APFS) after the release of High Sierra, you might want to be assured that everything is fine with your data. On top of that, macOS has powerful built-in utilities to address issues with the file system.
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