RAID formatting

Hi,
I am currently using one HDD for windows and documents. I have 2 more HDD's laying around that i want to setup as a RAID0.
If I do that, will it format all 3 HDD's, or just the 2 HDD's that I set up as a RAID0?

All of them son, all of them.JigglyWiggly_

Wait, do you mean you just want to RAID the two other hds? In that case, your main OS drive will be unaffected.

Wait, do you mean you just want to RAID the two other hds? In that case, your main OS drive will be unaffected.

JigglyWiggly_