By the time I got into computing, 3.5-inch floppy disks were still around but their use was on the decline. I admittedly knew very little about how they worked but this 15-minute video from The 8-Bit Guy certainly changed that.
If you're interested in taking a further stroll down memory lane, I'd also recommend checking out their video on cassette tape drives. The channel has plenty of other cool videos as well, like this one on modding a battery backup unit or this one about using a heatsink to cool a microwave dinner.
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