I have a MacBook that will boot up from an external SSD that has macOS Sierra installed.
However once I boot into macOS and see my disks using diskutil list, no physical internal drive is found. Only the external SSD as disk0.
The internal SSD on a MacBook from 2016 is soldered onto the logic board, and after opening the MacBook, there was no corrosion found, and no liquid was ever spilled onto it. So I don't think that the SSD died.
Is it possible that if the SSD is alive and well, that it then wouldn't be listed as a useable drive? I had deleted all the partitions like "Macintosh HD" and "Recovery disk" by mistake, and maybe now the drive is not accessible by the MacBook?
Also, its worth knowing, the MacBook came with OSX - El Capitan, but still boots with macOS Sierra.
Thanks for your help in advance.
Cmd-Opt-Rwhile booting). Then open Terminal, (under Utilities menu), as issue the command
diskutil list | grep disk0$ -a 5and edit your question with the new info.