From the listing, look in the Identifier column for your disk identifier. If you have an external bootable disk, connect this to your Mac and power your Mac up whilst holding down the OPTION/ALT key.It will look like ‘diskx’ where ‘x’ is an integer starting at 0. Then select the desired external drive from the startup manager screen and press the enter key. If you have used our method above to create a bootable installer, choose ‘Disk Utility’ from the available menu. If you have created your own bootable drive with a full system, open Disk Utility from /Applications/Utilities. Select the ‘First Aid’ tab and verify the troublesome disk, repairing if needed. First, restart your mac Sometimes when you turn it back on, everything returns to normal. Secondly, Repair the unmounted Macintosh HD in recovery mode. The Macintosh HD is unable to be mounted in Disk Utility normally, you can try to fix it with Disk Utility’s First Aid in Recovery Mode.
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