Before trying my hands again at solving the SSD error, @adamscott suggested in my Mastodon post to use 86Box to emulate the Windows XP OS in my hardware, instead of installing Windows XP. It's a software I never heard before, so I investigated it a bit. It was a good suggestion, but I could see those problems:
So I dropped the option of using 86Box and went back to look on how to create a bootable Windows XP USB with the drivers I needed.
I started looking into lots of forums and tutorials, and the best one I found was this one: https://windowspro.eu/installing-windows-xp-on-ssd-disk/.
The tutorial mentions that I could enable BIOS Hard Disk compatibility mode so I could install Windows XP anyway, and later change the HDD operating mode with registry tweaks. Seemed like a no-brainer to me, but it didn't work. I had the same
7b BSOD problem as before.
So, I tried the next tutorial option: to create a Bootable CD with the drivers I needed.
BUT, fun stuff: I can't create a Bootable CD, because the DVD reader from my laptop was just that: A DVD reader. Not writer.
So, I had to move forward with the assumption that a Bootable USB would work the same as a Bootable CD, which may as well be a completely wrong assumption (during Driver installation, the setup is specific in saying it's looking for extra drivers in the CD or floppy disk (lmao)).
More fun stuff happened now:
Using DP_Base, I finally created a new version of the Bootable Windows XP USB I was using, set the installation to install drivers before installing Windows XP.... and it didn't work, because it couldn't find any drivers to install. I tried using another Windows XP base ISO just to be sure, but to no avail.
This was no surprising to me at all, since the whole process was convoluted as hell, I couldn't find good sources of information, and I was relying on software that is not even supported anymore to create a Bootable USB of an OS that is even less supported. It's part of the course, but it reminded me that most information on the internet is not made to be preserved. Maybe if I bought the Fujitsu notebook and tried to install Windows XP on day 0 back in the day, I'd be able to find the drivers, software and information I needed. In 2023, that's definetly not as easy, and maybe just not true at all.
I'm not so much of a masochist as to keep fighting my own SSD just so I can install Windows XP, so onwards to plan B:
I checked how to remove the SSD from it, and I'm planning to replace it for an HDD. I double checked and it seems like Windows XP (with SP1) is compatible with SATA III under 2TB, so I'll buy something on the range of 1TB (probably? It's the least and cheapest SATA I could find) and replace the SSD.
Let's hope for the best.