> The raid is indeed an Intel Matrix RAID. The BIOS is configured so that > the sata controller is in RAID mode, and the "OPROM" is set to Matrix > Raid. > I would backup ALL your file systems off that disk, perhaps using a Linux rescue CD, then configure the controller in the BIOS for JBOD, use a rescue disk to build mdraid partitions, and restore your files from the backups. you may have to rebuild the /boot/initrd on the system to dump the fakeraid (dmraid) driver and enable the mdraid native linux raid driver Fake Raid like Intel Matrix Raid is NOT recommended for linux/unix systems http://thebs413.blogspot.com/2005/09/fake-raid-fraid-sucks-even-more-at.html someone's procedure for undoing a fakeraid. http://www.brandonchecketts.com/archives/disabling-dmraid-fakeraid-on-centos-5