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Within OS X Utilities, choose Reinstall OS X. Prepare a clean external drive (at least 10 GB of storage).

The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. If you used Disk Utility from macOS Recovery, you can now restart your Mac: choose Apple menu  > Restart. Install older OS X onto an external drive. 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. Once Mac enters Recovery Mode, you will be able to Reinstall macOS, Restore Mac from Time Machine Backup, use Disk Utility and use other tools to fix problems. 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. Download Os Utilities For Mac - Best Software & Apps Mac App Store.In this example, the last volume on the disk is Macintosh HD - Data.Ĭlick Run to begin checking the selected volume for errors. Mac OS X Built In Utilities Apple provides a slew of utilities as part of Mac OS X, many of which are useful for troubleshooting and maintenance. For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab.