Mac dick utilities
28 Nov Tucked away in the Utilities folder, Disk Utility and its First Aid feature can be used to check if a disk is damaged and repair it, create a disk image, partition a disk, and so much more.
How to use Disk Utility on a Mac - Macworld UK
How to use Disk Utility on a Mac
If you have problems with your disk, use Disk Utility on your Mac to test and repair it.
Description:Your apps are quitting unexpectedly. You have a corrupted file. You need to mount, unmount, or eject a disk.