Hi, I am new to the forum and I am hoping someone can give some advice here. ASUS support hasn't replied to my email. System specs are as as follows: A8N32-SLI Deluxe 2 x 74GB Raptors (RAID 0) AMD Opteron 165 1 GB Dual Channel OCZ Gold DDR400 Toughpower 750W PSU 7900GT ASUS DRW-1608P CD/DVD Drive I have been using a RAID 0 setup on Win XP using two Western Digital 74GB Raptor HDD for over a year now with no problems. There are two PATA optical drives attached to the Master IDE cable and no other HDD in the system. The HDD have been running off the Nvidia SATA ports (one and two) using NVraid enabled through the bios. I recently purchased a Single WD Raptor 150GB SATA to run off the nvidia SATA port 3 as a separate drive (not part of a RAID array). I can configure the extra HDD through the BIOS by enabling SATA ports 3 and 4, disabling raid for those ports, setting the Hard Drive and Boot settings to continue to boot from the RAID 0 array on SATA ports 1 and 2, and the system boots fine. It recognises the original RAID array and the 150GB Raptor as a separate disk. The problem is whenever Win XP starts to load, it gets to the loading screen and the system reboots every time. I have tried different SATA hard disks in place of the 150GB Raptor (same thing), Windows safe mode, testing the setup with a bootable CD (which is fine), and even plugging the extra drive into the SATA 3 or 4 port once windows has loaded (which is fine, and I can format and use the drive then). The problem is whenever I load windows with a SATA drive attached to SATA port 3 or 4, the system crashes and reboots. I have been told that this problem has been experienced by many people, so I was hoping that some sort of resolution has been identified by ASUS. To me, it seems like a driver or BIOS related problem. I am using the ASUS 1405 BIOS. Also, does anyone know where I can get this BIOS modded with the latest Nvraid BIOS? I have also tried disabling NCQ on all drives. Any help is appreciated.