You won't.I have an 8 core late '08 macPro and have configured 1 mirror+1 spare so hoping to use the last drive in Bay 4 as a Boot Camp Win7x64 disk. So far all attempts have failed. After formatting the said drive as MS-DOS using SL Disk utility, Win7 still does not recognize it and can't find drivers. I even tried the same scenario with a new drive attached to an ODD port (making sure the raid drives were all pulled out of course). No luck.
It seems that when you create an array, it makes a change in the firmware (i.e. RAID mode rather than the default = Legacy to all the HDD SATA ports - that is, they're tied together) that prevents Windows from installing.
Either of these methods will work.Does installing Win7x64 native on another raid-less MacPro first work?
How about a boot-camped Win7x64 drive built on another radi-less MacPro?
You could keep the OS X array on the logic board, and use a PCIe SATA card to place the Windows drive on (inexpensive example). It's actually a 2 port card, but you can configure it to a 2 + 0, 1+1, or 0 + 2 configuration (SATA and eSATA respectively). It also has Mac drivers available on Silicon Image's site (here; you just won't be able to boot OS X from it; Windows OTOH, will boot).Looking for options here before I consider a new Raid card (Caldigit?) or all the tricky efi,grub,ubuntu hacks I am reading about.
If you do want to run a RAID card, I'd skip Apple's or CalDigit's offerings. They're both junk.
Hope it helps.