A tiny, choice item, subset of my floppy disk collection.
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Left, first generation formfactor floptical/magnetic optical.
Full size, mine, and micro
Middle. The floppy disk. 10” on bottom. This one is technically an 8”. The cartridge design supports and came as 7.5, 8, 9, and 9.75 inch disks depending on manufacturer and date. The “Bernoulli” disk in this first generation style was capable of up to 10.2 inch disks inside but nobody made one.
The box cartridge is 8.3x10.8 inches or 10.5x10.8 inches. The latter being quite rare and very limited. This is one of the former type.
Standard 8”, 5.25”, 3.5”
Right.
The venerable Zip disk. A Famicom game disk. And a reverse spin floptical.