For some reason I've always thought that RAID would only work of two of the same interface were put into the array. But I saw some motherboard specs that pointed out that you can have RAID with an ATA and a SATA. I'm still unsure how a RAID array works, but in RAID 0, if you put together the Western Digital Raptor 10,000RPM and lets say a Western Digital 7200RPM, would it work as fast as the 7200? Or would there be a compromise between the two speeds?