For the record, I realise I can probably re-create the RAID by setting all disks to non-RAID then setting it up as a new RAID with same settings etc... then recover the partition via alternate methods.
Drive order is going to be a pain though... no idea... new board as well so port allocation probably matters.
4 drives - 24 possible combinations!
What worries me is that from reading on the web this seems to be a common problem... would it be fair to say that IRST is not exactly stable?
Why would a BIOS reset, for example, erase metadata on disks? As long as the BIOS is set to RAID it should not have any impact...
Sorry, looks like intel's shitware only works so long as you never ever change anything after you make your raid. Same thing happened to me with my raid 10, it was just a small bios setting, check your new board and see if the drive settings are in raid mode or if their in ahci (if so then thats what fuxked it).