GBB36X Mirror - how to break

[rnem170uk]

I have a mirror on my GA-P35-DS3P mobo which contains my boot os.  I want to take out one of drives to build a new PC but when I attempt to 'break' the mirrror, I'm told you can't - because is contains the OS.  Am I doing something wrong, or it is really that bad...

[rnem170uk]

ok, figured it out...  

1.  Turn off PC
2.  Disconnect one of the drives (second one for me)
3.  Boot up
4.  Hit CTRL-G when degraded state is reported.
5.  Select the option to revert disk to non-raid and ignore the warning that everything is going to be wiped.   (Hitting 'del' makes it feel even worse) 
6.  Save & Exit (reboots) 

Works perfectly.