Did Iomega get some important OEM wins? I seem to recall more retail PCs advertised with Zip drives built in than SuperDisk, although you'd think "you don't need to add another $10 to the BOM for a regular floppy drive" would be an appealing message to large OEMs.
Or maybe Imation, spun off from 3M's massive financial muscle, couldn't compete as aggressively.
I've turned into a bit of a SuperDisk drive hoarder; I've got one in my main desktop-- and a stack of spares I've shucked from external enclosures.
Zip disks opened up a world of not terribly expensive storage much larger than floppies, but with similar characteristics. There wasn't any real competition, so lots of OEM deals happened, especially in school / library shared use situations.
The LS-120 is a nicer product, and it includes a high precision regular floppy drive, and it means you only need one 3.5" device... except that it had to compete with the entrenched zip disk that was almost as good. Plus around that time, cd-r drives were becoming affordable; media characteristics are different, but capacity was much larger.
Yeah. Apple. Pretty significant.