I made these diagrams to generally explain to a college class how file storage layers work on a drive and now when you delete/format the filesystem the file data remains. I couldn't find one online, so made one. What do you think? Any significant issues?
Version 2 based on your feedback. Thank you.

@climagic you could add more layers if you wanted: gz > tar > eml > MIME > base64 > jpeg > steganographic message.

Of course, you could add infinite containers. Something something it's turtles all the way down.