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.
Version 4. Ok, I'm done for tonight. Thanks all.

@climagic
On most modern systems, the operating system will offer (Linux install) or come with default encryption (Android/iOS) at the OS level. Additional to the (earlier mentioned) possible encryption at the device level.

Also I think _if_ you want a file example with multiple contents. I'd go for a mkv or webm file with 1 video, multiple audio and subtitle streams and their metadata. Or maybe an office file (odt/docx) which are actually zip files that contain a ton of files.