To do so, connect an external disk, then open Disk Utility and choose File > New Image > Image from Folder. If you used Disk Utility from macOS Recovery, you can now restart your Mac: choose Apple menu > Restart. You may need to create an image file of your startup disk. The order of repair in this example was Macintosh HD - Data, then Macintosh HD, then Container disk4 and 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 has finished 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 start checking the selected volume for errors. To simplify the process, choose a short name. For each disk you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab. Open Disk Utility, select the USB drive, and click the Erase icon.
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