My first HD had 40 MB, and I wondered how anybody could ever need so much space. (Actually, it was 2x20MB because MFM couldn’t do more than 20MB.)
But the coolest thing I ever had in terms of file storage was my first HD > 1GB. It was a 2GB HD, 5.25" full-height (3.25" high) drive that sounded like jet engine when it was powered up.
My first machines were servers, and had those "full-height" disks. Do they still exist? I don't think so.
I don't remember the capacity now, but I recall an IBM SCSI brick-size disk, warning on the box, "Dropping this disk as much as one inch may destroy it."
It also said something stupid like unwrap before use. WTF were they thinking?
I didn't meet computers until late in life. Although I started with Unix, the DOS PC was already a thing (and, I thought, a very boring thing!).
I read an amazing article about *real programmers* of old. Apparently there were people who could take into account the rotational speed of the disc platter --- and for the stuff they did, it mattered!
But memory was once very far from cheap, and if a program was required to reliably and consistently process a data stream, then the above skill could make all the difference.
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