I like the very early microcomputers where the storage is paper tape punch / reader. Your ASR-33 basically types in your program, or punches it on tape when you "list".

You can see some of these on "deramp"'s videos (he is selling Altair clones, but even so the videos are great demos).

https://www.youtube.com/watch?v=qv5b1Xowxdk

The next upgrade to this is something like the AC-30 for SWTPC. It does exactly the same thing, except uses cassette tape.

https://www.youtube.com/watch?v=gLvfUJd5PjQ

Then came disk drives, but no DOS. Instead they use disk the same way you used the cassette:

https://www.youtube.com/watch?v=rdCnj8iL1hI

It was up to you to remember which track your file was on..

Next step: file names, but no automatic space management:

https://www.youtube.com/watch?v=w4xmZwcM52w

You write files sequentially to the disk, and you can only write to the end. When you delete there are holes. You can run a defrag program to recover the space.

This stuff was all just before my time, but there were vestiges of it in later operating systems in the early 80s.