I haven’t done this with My Cloud… It is still too new!
But I have done this with a My Book. The spot where the USB plugs into the back of the harddrive broke, and I needed to get my information off of it. When I called in to support, I was told that I could remove the harddrive and attempt to recover my info without breaking the warranty (Probably wrong… I didn’t think the lady knew what she was talking about - she also told me that my warranty was up at the end of November, when it was actually up at the end of October, so I missed getting it replaced…).
The only issue that I had with connecting the My Book to my computer was that it wouldn’t read it!!! Seriously. I purchased a couple of housing units for harddrives, and attempted to plug in the harddrive. Nothing would read it. Couldn’t even tell that it was connected. I returned all these units, and ended up going to a data recovery company. After $4,000, I was able to bring hom a brand new harddrive with all my old files recovered. The broken My Book was just a brick… since I missed the warranty date by a week.
I have opened other My Books and tried to swap out the harddrives, and for some reason, if they do not have the specific connection that it came with, it will not read. I did this with 3 different harddrives. I am not sure why, some sort of specific software on that connection? I am not sure…