As long as you are using macOS to manage the drive then yes the WD drive is compatible. If you are using the WD software, then you need to contact WD to see if their software is compatible as I'm sure the WD website may contain misleading information.
Summary of Contents of user manual for Western Digital WD ShareSpace. Page 1: WD ShareSpace™WD ShareSpace™ Network Storage System User Guide Page 2: Important Safety InstructionsImportant Safety Instructions 1.Follow all warnings and instructions marked on the product. Western Digital provides data storage solutions, including systems, HDD, Flash SSD, memory and personal data solutions to help customers capture and preserve their most valued data. When I found the WD ShareSpace 4TB at the price it was listed, I knew it wouldn't be a high performer, but for now, it would fill my needs. The ShareSpace uses software RAID. This provides two things: easy configuration and management, and heavily reduced cost. Western Digital ShareSpace (8TB) overview and full product specs on CNET.
FYI, it is much safer to just have macOS manage the WD drive. To do so just move everything on the WD drive to another drive temporarily. Then use the WD software to disable any security features on the WD drive. Then uninstall the WD software by following the manufacturer's instructions. Now use Disk Utility to erase the WD drive as GUID partition and MacOS Extended (Journaled) if you are only using it on a Mac or as GUID partition and ExFAT if you will share it with a Windows computer. Now move all your files back to the WD drive.
Once everything is working you can upgrade to Catalina. Just make sure to have good verified working bootable backups before upgrading in case something goes wrong or you decide you don't like Catalina and want to revert back to the current macOS.
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