Ouch! This isn't a great time. Can you do: mdadm --examine /dev/sda1 mdadm --examine /dev/sdb1 You should do this for all four disks, and all partitions on each of the disks. Also, can you show: cat /proc/partitions as well. But maybe you setup hardware RAID on your old motherboard? Can you provide more details on how you have the old one setup and what model it was? Did you use the Intel software by any chance? Do you have an 'lsdev' output from before the motherboard swap? Good luck! John