I have just purchased a 4TB WD My Passport so that I could connect it to the USB port of my 4TB WD My Cloud (running firmware v04.05.00-342) and act as a backup for My Cloud. Despite being the same company the devices do not work together.
The MyCloud Desktop (v.220.127.116.115) nor the drive itself when opened via Finder, is able to recognise the My Passport regardless of how the device is formatted. I have tried both HFS+J and ExFat as offered by the WD Discovery software (v.3.9.234) on my Mac (running macOS High Sierra 10.13.6). I even tried formatting it via Disk Utility to a Mac OS Extended (Journaled) format but this also doesn’t work.
I haven’t added any extra security or anything like that - it’s just a plain formatted external hard drive. This is VERY annoying. Please help! Thank you.