Do you have the bios storage configuration set to AHCI? I know a lot of people are not happy with the Marvell controller but it is usually when a SSD is connected to that controller. Have you tried changing the sata cable and the sata power cable and making sure you are using the sata3 cable that came with the MB. Is the Velociraptor the only other hdd (besides the Revo) ? You could have a defective controller chip. I don't know if you want to go this route but you could get an add on card with sata3 ports on it and bypass the Marvell chip altogether.