First read through this to find out what you have to do as far as drivers. This is if you dont want to do a re-install.http://www.tomshardware.com/forum/196922-32-switching-storage-controllers-reinstalling-windows
I think with your soutbridge you can create a mirror from an existing drive. So, if you get your drivers setup right you can switch your BIOS SATA controller setting from IDE (or whatever it is in your BIOS) to RAID. If your computer boots then install the RAID software that comes with your motherboard. Once inside here you will find options to create the mirror. I'm not sure the exact steps, but I know it is somewhat intuitive with my motherboard.