Do a forum search, the topic of recovering data from a drive has been discussed repeatedly. In certain cases the data can be easily recovered if only the firmware is corrupted and not the user data partitions on the drive.
Because the My Cloud hard drive is formatted as Linux, the Windows OS won’t read or access the hard drive (when removed from the My Cloud enclosure) unless one installs third party software. Instead one can download and create a Linux boot disc (to CD, DVD or USB flash drive) and boot their computer with that boot disc to access the hard drive which has been removed from the My Cloud enclosure and connected to the computer.
A few threads on file recovery, there are many others:
https://community.wd.com/t/file-recovery-on-a-corrupt-mycloud-4tb-drive/160949
https://community.wd.com/t/mycloud-is-dead-and-need-to-recover-data/158346
https://community.wd.com/t/how-to-recover-deleted-files/92885
https://community.wd.com/t/how-to-recover-my-data-from-a-bricked-4tb-my-cloud-hard-drive/137874
