With the latest bios and drivers from Intel, the D975XBX motherboard does not support SATA drives on the primary SATA controller. The secondary SATA controller works fine. The D975XBX2 motherboard does not support SATA drives on either controller. This may also be a problem with other Intel 975 chipset motherboards. Hopefully, they will provide a fix for this soon. If you need a workaround try a Silicon Image chipset based SATA controller card. The ATA IDE controller on thes motherboards works fine. Also, you can add additional ATA IDE drives by using SYBA (Silicon Image 680A chipset) IDE controller cards. They work very well but may need bios and driver updates from siliconimage.com. Edit: I was referring to SATA DVD and Blu-ray drives. See further info below.