A lot of older drives are full-height drives rather than half-height (like the original drive in your LCIII, and most modern drives), since back then they often needed more platters to make such a big drive.

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[nitpick]Full height is 3.3". What the OP has is a half-height drive. The LC family originally shipped with 1/3 height (1.1") drives.[/nitpick]

Full height is two CD-ROM drives stacked. For fun, one can find the old Seagate ST410800 drive. They were selling at quite a discount about eight - ten years ago. They were one of the very first 9 GB drives and they are a full height, 3.3", 5.25" drive. And they sound like a dishwasher...

Probably any newer hard drive would seem much faster than the original 80 MB drive. While they all have about the same electronic interface speed (5MB/S or 10MB/s SCSI) the speed of the heads, platter and the data density improved dramatically between when the 80 MB drive was king and when drives reached multi-GB capacities.