this post was submitted on 27 Sep 2023
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I unplug physicals disks when installing windows. Learned the hard way when windows placed the boot partition on a device it could not detect the filsystem of. It destroyed my RAID disks (a little but my fault, because I messed up the recovery).
This is what Windows installer saw (going by memory, this was 8 years ago)
What did it to? It created a new partition table and wrote data to a new boot partition it made on one of the 8TB disks, no questions asked.
So, to the people who answered you that windows installer cannot do this. Maybe they fixed it. But it certainly could, and it cetianly did. I remember very carefully going through the installer because I was concerned about this happening. I thought about unplugging them, but was lazy. Because "it would be insane for windows to write on a disk it cannot identify the file system of".
Lessons learned:
Edit: I found post on this way back when, but leaving what I wrote as is.
https://superuser.com/questions/758854/mdadm-win7-install-created-a-boot-partition-on-one-of-my-raid6-drives-how-to-r#1243636
I had remembered some details wrong. I had unplugged the Linux SSD, and it wad raid 6 not 5, and it was 2TB disks.
Windows couldn't even use its own system image to restore my system when a botched Windows update messed everything up. I still don't know what was wrong but I think it did something like try to apply them as GPT instead of MBR on my BIOS system.
Fixed or not this is good to know. I use a separate device for RAID storage and I think I'll keep it that way. Sorry you had to deal with that. I know if my main storage got wiped by windows installer my reaction would probably make national news.
Will proceed with caution and saved drive images!