Back in the mid to late 1990s, digital cameras had a storage problem: they either used expensive memory cards or built-in memory with limited capacity and awkward cables. Both were holding back the adoption of consumer digital photography, so in 1997 Sony came up with an alternative so cunning that by the end of the decade it became the best-selling digital camera series in the US. And like the best ideas, it was so simple: just record photos onto standard 3.5-inch floppy disks.
Source: Sony Mavica FD5 Retro Review: The Camera That Used Floppy Disks | PetaPixel