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Message: <blockquote data-quote="Steve_G" data-source="post: 1940968" data-attributes="member: 298483">First thought, why not try Disk Utility First Aid on the "CCC clone" disk. Did that and it was able to unmount  the disk and repaired Disk. Except the Disk Disk Utility window froze, was not responding. Opened up Activity Monitor and "quit" on the Disk Disk Utility. Back to normal.Rebooted with the option key and selected the CCC clone. Took awhile to come up, as I was going for the Disk Disk Utility icon, the computer shut down, Black screen. Had to pull the electrical plug to get it to reboot.Ran the first aid on the Macintosh SSD, repaired successfully, no errors. I guess I'm "out of the woods"?</blockquote>