You have to break the mirror before replacing diskRegards, Ravikumar P

Hello, I am having problems with a hard disk on an Windows 2008 R2 Domain Controller. The volume (C:) the machine is booting from is a software mirror and the two disks are showing in Disk Manager as Disk 0 and Disk 1. Disk 0 is having a status of Errors (online). I tried to replace Disk 0 with a new disk. However, when I try to reboot the server the BIOS will not see any disk to boot from. What steps do I have to perform to replace Disk 0? Thank you very much in advance, Thomas