Run First Aid From Recovery

If youre asked for a password to unlock the disk enter your administrator password.
Run first aid from recovery. If you need to start completely fresh then youll want to erase your startup disk using. First Aid will run checking the health of your Macs drive. There I launch Disk Utility Repair on my startup SSD but still Disk Utility greets me with the same message.
If recovery mode doesnt appear restart your Mac and try pressing the keys again In OS X Recovery click the Disk Utility shortcut to launch the Disk Utility here. To verify your SSD drive enter the command- diskutil verifyDisk devdisk0 Then enter diskutil repairDisk devdisk0 command to repair your SSD drive. Run First Aid from Recovery while in RecoveryHelpful.
Dymar Feb 26 2019 519 PM in response to dominic23 Thanks. To repair the startup volume run First Aid from Recovery. A drop-down sheet will appear asking if you wish to run First Aid on the selected volume.
So Disk Utility failed in exactly the same way when trying to run first aid. These problems include data structure repair and hard drives having trouble mounting. It includes how to use First Aid how to run First Aid from macOS Recovery mode and what to do if Disk Utility First Aid fails or is not working on your Mac.
Assuming that is successful go ahead and quit Disk Utility then click reinstall OS at the top. Because there are two types of Recovery Mode. Option Command and R.
Click Quit Disk Utility. Also newer systems no longer use hard drives and it. This content is about Disk Utility First Aid on your Mac.