I remember in the mid-90s a customer had just prior to my contract with them starting deployed some 3COM enterprise core routers. They were having issues with connectivity to their Banyan Vines servers which I tracked down to an issue with the routers. 3COM had a bug fix but the routers required the use of 2.88MB floppies to upgrade them. Neither the customer or I had a 2.88MB floppy drive to write the upgrade to. It took 2 full days of searching to find anyone who could get me one in less than a month.

I know it's security by obscurity, but this would secure the data a very decent amount lol

Not quite obscurity given the attackers could measure the disk and do a quick Yahoo search. Maybe, security by antiquity?

Both. There was an episode in the second `gig` of GITS anime that showcased this model to secure a character's secret ledger before hackers fried his brain.

For a brief period, I kept a copy of my /etc/passwd and keyfiles on a HiMD disk with an RH1.

I’m curious now because I don’t recall the episode - what was the episode title?

Fabricate Fog

I heard they were superfamicom cartridges

I think you mean famicom. Unless I'm mistaken, the famicom and the 64 had floppy drives add-ons (FDS and 64DD), but I don't think the super famicom did. Unless you're speaking of 3rd party tools like those used to copy games, but afaik they use standard floppies.

Maybe HiFD or SuperDisk, Iomega something-or-the-other...

Don't worry they were Bernoulli disks