Hard drive formatting question

This week I'm heading to a friends house to format his PC and help with setting everything back up.

Now, the way the person who built his computer did it was, he put in two 80gb drives, but used Raid or something (not too sure) and combined them into one drive. I plan on writing 0's to the drive(s) then stick XP pro on it, so how would I go about doing it? format it normaly? Can I de-seperate the drive? Maybe unplug one and stick the other as Master? =/

Also, he wants to know if he'll lose HD load speed or something, I'd guess at saying he'll load thigns faster cause it wont have to go between two drives to do it, but you're the experts here.

So just as a reminder, 2 80gb drives merged into one, wanting to zero the drive before installing windows, how would I do it.

Jam it back in, in the dark.

So it would be best to "un-raid" them and put that back to two seperate drives?

There's nowhere I can't reach.

Alright. Now that its settled, how would I go about un-raiding the drive?

His motherboard is http://usa.asus.com/products.aspx?l1...76&modelmenu=1

Would it be in the bios? Some other menu that you'd get into upon startup?

This thing is sticky, and I don't like it. I don't appreciate it.