![]() Once Disk Utility has loaded, choose the disk you wish to repair - the default name for your system partition is generally "Macintosh HD", and choose 'Repair Disk'. Select Disk Utility from the macOS Utilities menu. Power on your Mac and keep holding the power button until you see the startup options screen.Check that your preferred startup disk is selected in Startup Disk settings once your Mac has booted. Shut down your Mac, then turn it back on while pressing and holding the Option, Command, P, and R keys together. Restart your Mac, and press Command + R, while it's restarting. To enter Disk Utility in macOS Recovery and restore the startup disk, follow the steps in solution 1.If trying to repair the internal partition where your Operating System is installed, you'll need to boot into Recovery mode, so your Mac can check and repair files that are "in use".If using an external disk, then choose 'Repair Disk', and allow the process to complete.The Bless command changes the startup disk. It should give you some diagnosis to confirm whether your drive is viable, or needs to be repaired. Type sudo bless -mount /Volumes/StartupDiskName -setBoot without the quotation marks into the Terminal window. This can be used to select any bootable drive connected to the Mac: Connect the external drive or device to the Mac. Once you've loaded Disk Utility, select 'Verify Disk' and allow your Mac to check the disk. You can locate Disk Utility within your Applications -> Utilities folder, or by searching "Disk Utility" in Spotlight. This requires the computer to be booted in Recovery mode, and as repairing the internal partition can have serious repercussions, we advise performing a back-up of any crucial data before proceeding. a Thumb Drive or an external hard drive) with a bootable version of Mac OS X on it by selecting. It can also be used on your internal partition if you are having trouble with OS X. You can change the Startup Disk to any writeable device (i.e. The most obvious example would be when there is drive corruption caused by improperly removing external USB storage. Repairing Disks using OS X's Disk Utility can be a useful way to improve performance, and in some scenarios, recover lost data. As much a we all try to protect our computers, sometimes issues do arise with the drives where you store your data.
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