If you are not using a Linux OS or do not have the proper drivers on Windows OS to access the My Cloud hard drive, one will have trouble being able to view the My Cloud hard drive partitions. Those partitions may show up as not formatted when in fact they are formatted for either EXT3 for EXT4.
If you can, create a Linux boot disk/USB drive and boot your computer with it. It should then allow you to access the My Cloud hard drive partitions. Ubuntu is one such popular Linux distro.
https://tutorials.ubuntu.com/tutorial/tutorial-burn-a-dvd-on-macos
https://tutorials.ubuntu.com/tutorial/tutorial-burn-a-dvd-on-windows
https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-macos
https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-windows
As previously indicated, if using Windows you must use a third party driver in order to be able to gain read/write capability to Linux formatted partitions that are used on the My Cloud.
