I've had this issue before. I have a clean install of WIndows 2019 Server on a HP Proliant Gen8 Microserver.
I installed it with just a SSD.
I then powered it off and added a HDD which is GPT and NTFS formatted with data on it. But it won't boot afterwards and gives error:
"Non-system disk or...
Windows 2019 Server setup keeps creating the System Reserved on one of the 5Tb HDDs instead of the SSD.
I tried following this YouTube video but it Windows doesn't boot after I complete command:
reagentc /info after 8 mins 57s
Is this video applicable to Windows 2019 Server.
The issue I...