If you want to reminisce about old floppy drives, and the other floppy formats that never made it, the 8-bit guy did a good video on old storage mediums: https://www.youtube.com/watch?v=AvXXkB2jic0
The sleeves are usually contact welded shut on the sides, so if one wants to keep the discs working, one of the edges can be undone and the disc can be removed like a letter from an envelope. "Transplants" are also possible.