I have tried to reformat a new WD 4TB external USB - it arrived NTFS (shocker). I at first tried to reformat the drive to AFPS, and that failed. The drive wouldn't even mount, and only appeared grayed out in Disk Utility (as disk4 - I have 3 mounted). Then I tried to reformat it JHFS+, that also failed. Same error. Then I tried to do both formats in Terminal. That also failed. Each time, I can connect it to Windows 10, and it pops up as a "Healthy" partition. I reformat it anyway as NTFS, and went back to macOS, only to encounter the same errors. So I went back to Windows 10, and reformatted it as FAT 32. Same errors on macOS. Then back to Windows 10. Then I tried exFAT. Back to macOS. Same errors. I have even tried Tuxera, that also fails. Does anyone know how to get macOS to reformat this drive as either AFPS or JHFS+? I returned 2 drives to Amazon for the same reason - I thought the drive was defective. Help!