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lock, so you cant overwrite?

This is the purpose of that thing that I remember 😅

Doesn't it stop you recording over it??

You also had 7'22 floppies.
I remember having Doom on 12 floppies.

Yep. Definitelty so you couldn't accidentally overwrite them. I still have a bunh of them waiting for some inspiration to make them into a fun project. Mini notebooks perhaps. Using them as the covers?