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#11
Thanks guys. I didn't mention that during the past few months, I've added data and programs to the nvme drive and so I want to avoid formatting it, except as a last resort.
I looked at the disk signature collision article. I think there is indeed a signature problem with my nvme, but it shows itself to be online and the purpose of the article is to bring an offline drive back to online, if I understand it correctly.
I've tried command prompt, fixboot but end up getting "Access denied."
Symptoms of the problem appear to be 1) The nvme isn't labeled as a windows bootable disk in the bios. 2) The nvme is GPT but perhaps should be MBR. 3) The nvme doesn't have a letter assigned to it. It seems I can, in disk management, name a partition on it but not the drive as a whole.
I will give MiniTool a go and report back.