Was just posting about this on my forums and it occured to me should ask you folks as well regarding SATA issues you may have.
I don't have any issues as I'm using single SATA disks in SATA 2 and 5 ports.
But, according to 2-28 page of manual, SATA 3/4 are black slave DATA connectors, SATA 1/2/5/6 are red master Boot connectors... so which ever your OS boot disk is has to be on SATA 1 or 2 or 5 or 6 AFAIK... ???
P5K Deluxe owners, care to share if you have SATA issues and which SATA ports you're using ?