i started on Unix/SunOS in 1990 then Linux in 1993 (i'm old) and even i have never even _seen_ a real 8" FD! i do recall using 5 1/4" FDs (though i can't remember what for).
Though I started with a 5.25" single-sided single density floppy in 1978: 88 Kilobytes.
I actually upgraded to the 8" floppies about 4 years later, but by then it was double-sided, double density. I thought all my Christmasses had come at once to jump from 88 K to 1200 K in the blink of a eye. I transferred a whole 5" floppy to an 8" floppy and I still had more than a Megabyte of space left! Wheeeee!
Round about then the first IBM came out, and I remember we looked down our noses at that miserable little amount of floppy space it had (160K) and we considered it a toy!
We didn't think that way only 3 or 4 years later when that "toy" completely wiped out our 8-bit world.
I explained how the 8" held far more data than the 5". The HD 5" 1.2 MB didn't appear till the late 80s, early 90s. The 8" 1.2 MB was around about ten years earlier.
8" floppy (IBM-3470 SSSD format was the standard format for CP/M software to be distributed on.)
I had gone from North Star DOS (5") floppy to CP/M (8").
https://en.wikipedia.org/wiki/Caddy_%28hardware%29#/media/Fi...
Our national post still had punched tape communications infrastructure on those days as well.