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One of my two separate 2TB SSds running Bazzite is my boot drive. I have 2 more seperate physical drives, a 1TB running Windows and a 2TB running CachyOS.
Edit: Not sure if it matters, but my 2TB SSD running (what used to be my primary Windows install) CachyOS is in the first NVME slot, my other 2TB SSD running Bazzite (primary boot option) is in the 2nd NVME slot and the 1TB SSD running Windows is in the 3rd NVME slot.
@AmosBurton_ThatGuy Ok, Catchy is based upon Arch, and I'm not sure how you can tell grub on arch how to look on other drives for bootable OS's. In Ubuntu it's an argument in /etc/default/grub, but arch it is entirely different and I've not run multiple OS's on it. But with Ubuntu there is a grub argument that says to look on other drives for bootable OS's and you need to enable that for it to find OS's on other drives. There must be something similar in CatchyOS, but since I haven't played with it, and when I was using Arch it was the ONLY OS, I don't know where to find that. Alternately, you could just switch boot drives in BIOS, or hold F8 after a reboot to select the Windows drive. I do understand though that it is a lot more convenient to have it in the boot menu, unfortunately I haven't any experience with Catchy or even Arch with multiple OS's so can't help with that.
Even in my motherboard's BIOS, the Windows bootloader is no longer showing up. I'm wondering if by removing what used to be my primary Windows install, it also removed the Windows bootloader. I still have a USB with a live install of Windows, can I use that to re-add the Windows bootloader?
Thank you for the help BTW! It's much appreciated.
It's probably a problem with the UEFI, the windows info got overwritten, and you can probably fix this with efibootmgr
It happened to me too, but unfortunately it was some years ago and I'm not at home to find the related notes that I took. I remember there was a windows utility to rewrite the boot loader. But probably in your case the boot partition is still okay, just the UEFI entry got overwritten and you just have to add it back manually.
Check the troubleshooting section of the wiki page to have a tip on the windows booting location
@AmosBurton_ThatGuy Yes you can, but I've not been using Windows frequently enough to remember how, but if you google re-install windows boot block I believe you can find instructions.