I had to do some fiddling about with my cables inside thebox and now I am getting a "Critical Error" about the RAID disks during startup. I have a gigabyte GA-MA770T-UD3 motherboard. Aparently the RAID controller is an AMD SB710 chip.

I'm pretty sure I know what happenned. The first time I rebooted I had forgotten the power cable on one of the disks in the RAID1 (mirror) and let it boot up. So I shut down and put the power back in.

So now when it boots up I go into the RAID admin interface (between the BIOS screen and the OS loading):

• it shows the RAID1 as in error the logical device has one disk and says the other is disconnected or missing
• the other physical disk shows up as a single disk

If I boot to the OS (Windows 7 32 bit) the data all seems to be there.

If I go into computer management it says my partition is on a disk and working OK. But the other disk is offline because:

"The disk is offline because it has a signature collision with another disk that is online"

So I am guessing because I STUPIDLY booted up with only one of the disks powered on, the other disk fell out of synch with the mirror and so now cannot rejoin the mirror.

How do I fix this? I want to get the RAID1 mirror working again. There does not appear to be any "Repair" option in the basic RAID admin tool which I get into during startup before the OS boots.

I have not made any explicit changes to the online one (but I guess the OS has probably written some admin data).