Then, input the “diskutil list” line, which will list out all the disks on the Mac. To begin with, you have to access Terminal application.Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. Lastly, select “First Aid” to re-verify the disk or choose “Erase” to format the disk at your will.Next, access Disk Utility from the boot menu.Then, when booting, hold down the “Option” key to select Recovery Partition.At this point, you can try solving it with Recovery Partition. If the error message appears during “First Aid” or formatting a non-boot disk, the above means will not make effects surely.
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