[GekkePrutser]

Funnily enough the first hard drives were like this too. They were a round pizza-sized (but a few inches thick) replaceable cartridge and could be inserted into a 'reader' which contained the heads.

But I guess work the data density required these days and the extreme closeness of the head to the platters this won't work anymore as dust would get in.

But this is how the first hard drives worked, we had some with our pdp-11 at the computer museum.