RAID 1 Mirroring

Hello.

I have had software troubles while changing my Software/Operating System around. I found out that you can put a HDD into Raid1 from the Raid Bios. What I read is that after doing so, I can add a second HDD and it will build a copy of the Operating system and the Software onto the 2nd HDD. In other words, I read that by putting a HDD into Raid 1, it will automatically back up my Software onto a 2nd HDD even though, they were not previously set up into Raid 1 array. If this is true, do you have to add the 2nd blank formatted HDD before putting the original into Raid1?

Thanks in advance.

Sounds good. Thanks for the info.