MyBook will not mount until I run full diagnostics

MyBook is correctly formatted but now MacOS thinks it is exFat ??? It won’t mount. I then run the WD Utilities Full Drive Diagnostics on it and it says it is fine and voila, it shows up again and is accessable. WHAT THE HECK. I am running latest version of WD Discovery and Utilities and MacOs Mojave.

Help! The full scan takes several hours.


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