It MIGHT be possible but it depends on if both My Cloud units are the exact same model and are using the same firmware version. Currently there are two DIFFERENT single bay My Cloud models. Each using slightly different hardware.
Who told you that or where did you read that?
So long as the hard drive isn’t damaged and is readable one can attach the hard drive to a computer and access it since it is in Linux format (EXT3/EXT4). If using Windows one may need to install additional software to read the EXT3/EXT4 format. See the following post for additional discussion as one such past discussion on accessing the My Cloud hard drive using Windows 10.
