Hello everybody You seem to have some ressource about Nvidia Disk controller. I've got a big problem with RAID and AHCI, and perhaps you could help me. Sorry for the "french" english... Windows XP (legal SP3) is installed for 1 year and work perfectly. I've got a Gigabyte GA-E7AUM-DS2H motherboard, with Nvidia MCP79 SATA Controller. There are 2 HD in RAID1 mirror, but I don't remember if the 2 HD was in AHCI or IDE. There are 3 partitions on this RAID. All worked good,until now... 1 - I've inserted a new HD disk in SATA (to repair another computer), 2 - after booting, a message disappear after 5 seconds, it was about AHCI but too short, no way to read, 3 - my Windows boot, so I can format my new disk and copy web files that I nedded. So I take it out and reboot, 4 - the logo of windows appears but the PC reboot after a blue screen. So I put SATA Bios on IDE, and Windows start. He succes to read my RAID0, and I come to the desktop without problem. But now my partitions are doubled. C:(system) is G:(system) too. D:(work) is H:(work) I see 6 partitions instead 3. The RAID is dead and the 2 HD are separate now ? I'm very anxious about the security of my RAID1, with this duplication of the HD in windows... What do you think ? Thanx a lot