F4 on Boot (Silicon Image RAID setup)
Choose low level format, each drive (250g drives, about 1hr each)
Create RAID desired (RAID 0 picked for this example)
Choose configure manually
64k Chunk size
Set up which drive is 0 in RAID, and 1 in RAID
Specify the size of the array (Default is max size)
CTL+E to exit utility, click Y to save changes
Boot off Windows XP install disk
Hit F6 immediately for SATA drivers
Hit S to load drivers from A:/ drive
insert floppy disk with Silicon RAID drivers for WinXP
continue with normal install (leave floppy in A:/ untill reboot asks you to remove)