Troubled at times, we have used Disk Utility through thick and thin. Now it has changed to support APFS, with some weird behaviour.
repair
Repairing permissions on your Home folder is a blunt tool which could cause more problems. This tool looks through for potential problems, letting you fix them one file at a time.
Why we can’t repair system permissions, and some pitfalls and promise in the new technique of repairing permissions on the Home folder.
Apple has started recommending users to repair permissions – not generally, but in the Home folder. Here’s my experience, and a tool to make this easier.
We stopped repairing permissions, because of SIP. Now Apple recommends it for a wide range of problems – only this repairs them on your Home folder.
OS X used to provide a keychain first aid feature. Now this has gone, this is the only way that you can try to repair a defective keychain: create a new one.
What does AppleCare cost, is it worth it, how can you get it, and can you transfer it? And more.
How not to lose data, and how to protect private and sensitive data, when your Mac goes off for repair.
Don’t let a repairer see a dirty Mac: they may refuse to complete the repair under warranty. Give it a clean first.
When my external drive woke from sleep. it needed repair, but Disk Utility cannot help. What should I do?
The Eclectic Light Company 