In the Size field, enter a size for the disk image.Ĭlick the Format pop-up menu, then choose the format for the disk: This is the name that appears on your desktop and in the Finder sidebar, after you open the disk image. In the Name field, enter the name for the disk image. This is the name that appears in the Finder, where you save the disk image file before opening it. In the Disk Utility app on your Mac, choose File > New Image > Blank Image.Įnter a filename for the disk image, add tags if necessary, then choose where to save it. If you used Disk Utility from macOS Recovery, you can now restart your Mac: choose Apple menu > Restart.You can create an empty disk image, add data to it, then use it to create disks, CDs, or DVDs. The order of repair in this example was Macintosh HD - Data, then Macintosh HD, then Container disk4, then APPLE SSD. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself. If you're asked for a password to unlock the disk, enter your administrator password.Īfter Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again.If the button is dimmed and you can't click it, skip this step for the disk, container, or volume you selected.If there is no Run button, click the Repair Disk button instead.In this example, the last volume on the disk is Macintosh HD - Data.Ĭlick Run to begin checking the selected volume for errors. For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab.
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