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.

Hi,

You could refer to the following link: https://support-en.wd.com/app/answers/detail/a_id/14800