1.44 MB is the formatted capacity, and that assumes an MS-DOS (PC) format. I don’t know about the PC universe, but on the Macintosh (back when we had floppies :)), that formatting scheme was called MFM. Our low-density format was different from yours–the PC low-density format was 720 K (half of 1.44 MB) but the Macintosh low-density format was 800K and it was GCR formatting rather than MFM. A hi-density GCR scheme (which was never used) might have put 1.6 MB on a floppy.
Nor was the Mac’s GCR format the most efficient format going. The Amiga put 880K on a low-density disk in native Amiga format (whatever that scheme might have been called). By extrapolation, that scheme might have put 1.76 MB on a hi-density diskette.
Wow, memory lane! Yeah, I used to have a SCSI Floptical on my Mac SE. It wasn’t a 200 MB device, though, it was a 21 MB device. (It did indeed also read and write to 720K and 1.44 MB floppies). I sort of assumed that the Floptical had gone extinct back when SyQuest was battling it out with Iomega. The cost of those 21 MB special optically-tracked floptical diskettes was close to the cost of a SyQuest cartridge 10 times its capacity. Did they really come out with a 200 MB version of the floptical?
I’d like to know more about how 30 MB is stored and retrieved on a plain old 3.5" non-optical unenhanced floppy. Not to cast aspersions on your veracity but that sounds farfetched.