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.

Clues to the causes of Mac startup problems can be found by analyzing when in the boot process the system fails. Problems may be related to the power supply, battery, hard drive, logic board, OS ...

The First Aid feature in Apple’s Disk Utility (/Applications/Utilities) represents one of the oldest and most helpful repair utilities available for your Mac. But ...

After a brief examination of how you get started with these programs, given that you can’t repair an active startup disk in Mac OS X, I look at the worst type of problem – hardware failures, after ...

It looks like Apple is very serious about investigating recent reports of startup and disk corruption problems with the iBook (see previous MacFixIt item). This Tech Exchange posting from Apple's John ...