So long story short, I fried all 5 HDDs in my system recently by send 12v down the 5v pins.
Setup was:
1x 8tb HDD parity
3x 8tb HDD media
1x 4tb HDD personal files and cloud
2x 256gb SSDs for cache
I have sent the 4tb drive to be repaired, but the shop doesn't sound confident in their abilities.
On the 8tb drives, I decided to try soldering a jumper over the 5v fuse (confirmed to be damaged, so I assumed the drives were protected). And wouldn't ya know it, unraid recognized all 4x 8tb drives as installed and healthy.
Plot twist.
Before the fry, I was having issues with one of the 8tb media drives intermittently dropping out. I have reason to believe the molex to sata power adapter was to blame. Anyway, apparently this drive was set to 'disabled. Contents emulated' before the fry occurred. So now, the system sees that drive as installed and healthy, but still has the status as 'disabled. Contents emulated' AND the 4tb drive as 'Drive Missing. Disabled. Contents emulated.
Is there a way I can tell Unraid that the 8tb drive is good to go and unchanged, then use parity to recover the 4tb drive?
As a note, if this is successful I'll be replacing the 8tb drives 1 by 1 using parity as well, unless it would be faster to just move the data to new drives via a file transfer.