If Disk Utility First Aid finds error in disk, does it ask what to do before it fixes it? Is this right way to check external disks? diskutil verifyVolume /Volumes/Backup What is correct code to check boot disk? diskutil verifyVolume ??? Disk Utility has two different kinds of checks depending which row is selected in side bar. Does these diskutil codes check both? If not, now i can force diskutl to check both?