What is Repairing disk errors this might take an hour? Disk errors are a common experience on your hard drive. They’re usually not critical, and they can be fixed in just a few minutes. But sometimes ...

Repairing permissions does occasionally fix issues. Apple has on occasion flubbed permissions depending on whether something is a fresh install, or an upgrade from several versions back. As for disk ...

Disk Utility is Apple's go-to macOS app for finding and repairing common disk errors, but if it's your Mac's internal disk that's the problem, then your Mac might not even start up into macOS.