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Small nit, I'm pretty sure 1980 5¼'' floppies where 360 Kbytes and not the later 1.2 MBytes.

1980 floppies were single sided with a smaller number of sectors: https://en.wikipedia.org/wiki/History_of_the_floppy_disk

"With version 1.0 of PC DOS (1981), only single-sided 160 KB floppies were supported. "

I thought the same thing. No one is going to buy a 5MB hard drive in 1979 that only stores the equivalent of 5 floppy disks.