Can't format cloned SSD that stopped booting in my MacBook Pro. Disk Utility always posts an error with mount and unmount issue. Any clues?

Is there any way I can reformat a cloned SSD that was used to upgrade my original HDD?
It suddenly stopped booting (a progress bar always appeared followed by a shutdown)
I've tried to reformat the SSD via USB case, and using Disk Utility, but it keeps on send error message with unmounting issues.
Any clues as how to overcome this problem?
Thx
Nuno

Have you connected that drive to another computer and if you have can you do anything with it on the other computer. If not then the drive has failed.

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