Error Booting TrueNas Scale - Unknown File System

[joeminator]

Booting my TrueNas Scale is failing and I am getting the following error trying to boot up my machine:

error: unknown filesystem.
entering rescue mode...
grub rescue>

My bootdrive is 256GB SSD. The Bios Setup can see the drive, but I keep getting this error. Does that mean my bootdrive has failed? Any suggested troubleshooting I can do?
If it's indeed a busted boot HDD, is it possible to replace it without losing the data in my pools? I haven't unfortunately taken a config backup, am I gonna lose all my data?
Any help is appreciated.

 

[joeschmuck]

Can you provide a listing of your hardware per the forum rules please. Are you using a mirror boot pool?

Odds are you need to reinstall SCALE.