raven [he/him]

The typical distro’s installer will just take care of setting up GRUB for you, don’t worry about that. I’m doing something similar with my home partition, except I made a home partition with all the expected user folders ~/Videos ~/Documents ~/Music ~/Games etc and then used overlayFS which keeps ~/.config/ and the like separate for each OS partition while letting me share everything else.

Can I partition /home directory in a different drive and still function?

Yes, easily done.
Open KDE partition manager
Create your new partition in whatever filesystem you like. NTFS can be problematic.
Now copy the contents of /home to the new partition.
Once it’s transferred you can delete the contents of /home, or it will interfere with mounting from the new partition.
Now open KDE partition manager again to set the mountpoint of that partition to /home and check “automatically mount on boot”

You can easily repeat this process to move everything to your new new drive later.

In future if you install linux again, you can do this in the installer by simply telling it to mount X partition as Y mountpoint, even saving all your user files across installs!

Apparently I’m wrong and Pop_Os uses systemD-boot not GRUB, which is surprising to me because unless things have changed I’ve always thought of systemD-boot as being underpowered for a lot of use cases.

If I’m reading the wiki correctly here, I think it’s saying systemd-boot cannot launch windows because it’s on another drive? https://wiki.archlinux.org/title/systemd-boot#Boot_from_another_disk

But on the other hand it’s interesting that it’s able to “see” the windows partition so I might be completely wrong.

Well it’s there at least. Hmm. I don’t know a whole lot about windows but you can certainly get back to those boot options you saw before by pressing shift while booting, which will open the GRUB options. I’d give the windows boot manager another shot from there.

If that ends up working you can change the grub settings to wait for input instead of automatically booting pop. If that doesn’t work then something is probably wrong with windows and I would just try reinstalling since it sounds like you don’t have anything on there yet.

From Pop_OS, if you launch the “disks” program, can you see the other drive there, and the NTFS windows partition on it?

I guess you don’t know what a Continuous Glucose Monitor is. It’s a medical device that is attached to my arm with an adhesive pad that monitors my blood sugar continuously, and reports it over bluetooth to my phone. What you’re talking about is a glucometer which I also have (freestyle lite)

Reading my blood sugar off my CGM without taking my insulin pump out of my pocket is huge actually. I’m using a $25 pinetime for that.