MyCloud is dead and need to recover data

My Cloud OS 3 Personal & Network Attached Storage My Cloud
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Are you connecting the dead My Cloud hard drive to a Linux OS computer? If not you will need to do so otherwise Windows (if your using Windows) won’t read the drives properly.

If the drive is corrupted then one can attempt to run recovery software on it. There are other threads that discuss that issue. Do a forum search and you should find several threads recovering data.