QUOTE (redmonke @ Jul 9 2009, 11:11 PM)

Ok, I don't really know that much about having multiple hard drives (never had more than one), but I'd assume it's like multiple partitions.
I'd wait for someone else's opinion, because I don't really know how these things are set up and which one is the one booting (if you know what I'm saying).

I have two hard drives on my computer, one with 2 partitions, and one with only 1 partition. When I ran Windows 7 Setup it listed the 2 partitions of one drive and the 1 partition of the other drive together, so I don't think it treats drives/partitions separately.
I'm pretty sure 7 will just set it up so whichever drive you install to will be the one that boots up. And if it doesn't it's only a matter of changing the boot order in the BIOS.