Missing boot drive

I just recently flashed and updated my C720, I was using arch without issue until I went to turn the Chromebook on and the internal boot drive is missing for UEFI.

Any ideas on what could of happened? I can’t seem to get it to show back up now.

Is there a way to use Shell to look up the device?

there’s nothing you can do other than removing/re-seating the drive, or replacing it. Is it the stock 16GB SATA drive? That shouldn’t have any problems