I would like to call out to the younger readers that this is not a typo. Think about how minuscule the capacity of this hard drive is, and also that it's entirely possible it was a full height 5.25" drive, which is 3.25" tall!
Here is a fun tour of old drive technology that goes into just how amazingly simple some of it is: https://www.youtube.com/watch?v=8LbFKV_pPAE
The MFM drives were… fun… in that if you connected one of the two data cables upside down, you’d crash the armature and destroy the hard drive.
Seriously though: the amount of miniaturization in storage is something I'll never get used to. From punch cards and papertape via cassette to floppies, harddrives (in various incarnations and densities) and now to solid state so compact that you could store all of the data that I've created in my whole life in something about the size of your smallest fingernail. Incredible.
Actually there is a typo there, it's Conner. But yeah, 40MB was even a luxurious capacity, my first HDD was 20 (later reformatted to 30 with an RLL controller)
-g=c800:5
Someone gave me a 30GB drive the other day. I still haven't figured a use for it?
It also meant lots of highly unreliable floppies !