my very first real job back in the early 90s was working for IBM Personal Software Products, which had (if I remember correctly) just shipped OS/2 v2.2. my primary job was triage and routing, i.e. "which line in Boca Raton do I transfer this caller to", based on what their problem was, if they were a Big Fucking Customer or not (we got a lot of calls from Abbott Labs who were an IBM shop at the time), if they had a service contract, etc etc
most of the calls we got were OS/2-related, as that was the most widely-used IBM Personal Software Product at the time, as it was something you could buy in CompUSA in a retail box. this was also before CD-ROM drives were universal, so many of these were floppy installs; one of the new and exciting problems that occurred while I was there was that the first IDE/ATAPI CD-ROM drives were just coming out, Gateway was putting them in their new desktop systems, and OS/2 didn't have a driver for that yet, just SCSI and the various proprietary drive interfaces (Matsushita/Panasonic, Sony, and Mitsumi IIRC)
the majority of my coworkers were just phone people, they had just enough tech knowledge to route the calls properly, but I was a young nerd (maybe 20?) and I wanted to get promoted and so I was learning stuff, and if I could give a caller a quick answer or fix and avoid routing them to the people who were paid properly in Boca Raton, that was fine with my supervisors. so I had to tell a lot of people that they couldn't install OS/2 via CD-ROM on their new system, but that we were working on it. (I think Warp 3 was the first version to support those drives but that was after I left)
anyway, one day I got a call from one of those big companies. there was the entire upper echelon of their IT group on a conference call, they had just performed an upgrade on a very, very fucking important server from OS/2 v2.1 to v2.2. everyone was on hand for it, and now the server wasn't booting after the upgrade process
I got their account details, and was writing up whatever we called a ticket internally (it was something very IBM and absurd) and getting ready to transfer them to the Big Accounts line where they would get white glove treatment, and I asked them what was happening when they attempted to restart the server
"we're getting an error message we don't recognize, let me read it to you":
OS/2 !! SYS01475
OS/2 !! SYS02027
I paused. "sir, if I can ask you to do something real quick before I transfer you? can you check and see if one of the upgrade floppies is still in the drive? I'm fully prepared to transfer you, but can we check this first, just in case? it may save you some time."
my supervisor got in touch with me later to say that they received a very angry call from that client the following week, not because I hadn't done a good job, they were very happy that I was able to get their server booting for them in about five minutes instead of the many hours of data recovery and server rebuild they were expecting, but because those error messages had required them to call in the first place
those error messages, which you get when you try to a boot from a non-bootable HPFS floppy, date to the OS/2 v1.2 release in 1989. their utter uselessness pre-dates the split from Microsoft and IBM that led to the development of Windows NT, and I'm pretty sure that if I acquired a copy of ArcaOS and formatted an HPFS floppy with it, it would do the exact same thing