Before optical media (CDs or DVDs) you had Floppy Disks, which were a flimsy piece of [plastic](https://upload.wikimedia.org/wikipedia/commons/7/7a/Image3%2C5%27%27-Diskette_removed.jpg) treated with iron oxide enclosed in a case.
Hard Disks are a several solid (hence the name ‘hard’ disk), circular sheets of [metal](https://en.wikipedia.org/wiki/Hard_disk_drive_platter#/media/File:Innansicht_Festplatte_512_MB_von_Quantum.jpg) “stacked” upon each other, however, much less portable that floppy disks, at that time.
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