A little install question about RAID.

To get those ~400mb/s with 2 same hdds like WD 740FD (important are 2 exactly same HDDS).

1.) Using PQMAGIC to format the two hdds with 16k Stripes and 4k Cluster correct?
2.) While the Installation of Windows, using the RAID disc.
3.) After the Installation, you have RAID0 (one partition for the two HDDs)

But... How do you formating the RAID0 Parition which is the system partition? One RAID with 2 HDDs gives you one partition free, correct?