Problem backing up to APFS
I just bought a new external hard drive (WD Elements 3D), then discovered Mac's new APFS file format. I have a SSD internal hard drive, and I think my WD Elements is a SSD as well, so I decided to give it a try.
I erased the external hard drive and formatted it as APFS, then partitioned it. Except I got message recommending that add a new volume rather than partition it. So I added four volumes.
When I look at my external hard drive and its volumes in Disk Utility, they're grayed out. They give me the size of each volume in GB, but say there's no space available in any of them. I can't see my external hard drive in Finder at all.
What's going on?
Thanks.