

I don’t think I changed anything relevant in the bios, I’m always quite careful with changing things there. Maybe I changed boot order to test live USBs a couple times. Reboots are frequent due to system crashes.
Also also, is it possible you have two disks, and grub is on one and your data is on the other? Again, kinda weird question, but it’s a kinda weird situation…
No, only one drive. I tried removing this drive, and it failed to get to GRUB. Plus, the rescue mode on Windows partition on the same drive that boots sees it’s own 200 GB of files, they are definitely can’t be anywhere but on 512 GB SSD.



Don’t recall doing so. I think I saw something about automatic switch to/from RAID and AHCI in boot logs?
I’ve actually seen “something/AHCI/RAID” switch in BIOS set to RAID. Will try switching to AHCI.
Edit: IT WORKED! I changed RAID to AHCI, now the system boots as expected. Thank you. Will change to solved.