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A: was the 3.5" 1.44MB micro floppy as pictured in the video, B: was the 5.25" mini floppy

No way. A:\ mostly was for those big square ones that could only fit 750k and were thin like a cardboard.

750k? That is a pretty uncommon "big square" disk.

(5.25" were 360kB and 1.2MB).

5.25 DD was 360 KB, and HD was 1.2 MB. However, there were also QD 5.25 disks which held 720 KB. But there were no 750 KB disks.

Man, I feel so old right now just for knowing that...