Ahhh, the kids of today.
Having started with the 133mm 1541 on the Commodore 64, with its double-your-disk-capacity-with-a-hole-punch, and then onto the Amiga with its 89mm disks of 880KB capacity, and then working on Honeywell front end processors in the early 1990's with their 203mm disks with around 240KB ...
You could also convert Amiga floppies from single to double density by adding a hole, giving you 1760kB. I didn't have money for quality disks, and found that "punching" the hole with a hot soldering iron lead to less problems than using what was probably the wrong bit in my dad's drill.
https://en.wikipedia.org/wiki/Advanced_Disc_Filing_System
(PS, it's 90mm. Odd that even outside the USA we said 3½ inches.)
I started with a TRS-80 Model 1 with a Shugart SA-400 drive connected to an expansion interface. 85K capacity.
My neighbour was a developer working in assembler, producing games for the TRS-80, and my first 'real' (as in monies being handed over) job was as a tape-copying, paper-folding, inserting-both-into-a-ziplock-bag monkey.