To reiterate, you will lose all of your files and settings and they will be irrecoverable, so please ensure you have backed up your important data. Once this process has completed, you should then be able to use Disk Utility to create a new partition table by formatting the storage device. It will be quicker to simply erase the partition table on the storage device, but if you want to be thorough, this is the best approach. Sudo dd if=/dev/zero of=/dev/diskX bs=10m If the latter, you can use the Terminal application to identify, unmount, and erase the storage device as follows: Note that you'll lose all of your files and settings, so if you have a Time Machine backup, it may be worthwhile trying to restore the most recent working backup beforehand. Whilst in recovery mode, you can also reinstall MacOS. Select Disk Utility from the boot menu Go to First Aid to verify and repair the disk, or go to Erase to format the disk Again, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above method may not work to resolve the problem. USB) storage device? If the former, you'll need to enter recovery mode (by holding Command+R during the boot sequence) and use Disk Utility to erase the storage device. UniBeast for Mac Easy to use utility for creating a bootable USB drive that can. Are you attempting to erase the storage device that contains the MacOS operating system installation, or simply an external (i.e. I do have a Intel NUC 54250WYKH running High Sierra (cant find time to.
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