MacOS partition/disk stops working

I am using a dell optioned 3070 micro with a SATA SSD containing windows and a NVMe SSD dedicated to MacOS. Yesterday I installed MacOS onto the NVMe SSD for the first time. Not everything works but at least it boots with graphic acceleration. The opencore efi partition only exist on the USB drive. Today when I tried to boot with the USB drive, I couldn’t find mac os in the opencore picker, but was able to boot into MacOS recovery dmg on the USB drive. In recovery the NVMe drive/MacOS partition doesn’t mount. Both windows and Linux can’t recognise the MacOS partition. Info such as Used disk space cannot be obtained.

I am fine with a full reinstallation. But I would like to know why the disk suddenly ‘disappeared’.

submitted by /u/Leading-Kitchen2206
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