Today it failed to mount on boot once again. I pressed "S" to skip mounting, and upon trying to mount it manually, I get: trinitronx@saturn:~$ sudo mount /media/terabyte mount: /dev/md0: can't read superblock trinitronx@saturn:~$ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d0 : inactive sda1[0](S) 732571904 blocks md0 : inactive sdb1[1](S) sdc1[2](S) sdd1[3](S) 2197715712 blocks unused devices: .....Ok... so now it's putting one of my drives on md_d0 again??? Why? Apparently ubuntu is bringing up the drives in the WRONG ORDER! All drives [a-d] are now 1 letter incremented in the alphabet. (ie: ubuntu thinks sdb1 should be called sda1, sdc1 should be called sdb1, etc...) I'm not sure which drive it thinks is sde now, because it says there's no superblock on it. How can I fix it's mistake? Debug info below: ----------------------------------------------------------- trinitronx@saturn:~$ sudo mdadm --detail /dev/md0 mdadm: md device /dev/md0 does not appear to be active. trinitronx@saturn:~$ sudo mdadm --detail /dev/md_d0 mdadm: md device /dev/md_d0 does not appear to be active. trinitronx@saturn:~$ sudo mdadm --examine /dev/sda1 /dev/sda1: Magic : a92b4efc Version : 00.90.00 UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn) Creation Time : Fri Jan 9 03:40:39 2009 Raid Level : raid5 Used Dev Size : 732571904 (698.64 GiB 750.15 GB) Array Size : 2197715712 (2095.91 GiB 2250.46 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Thu Jul 1 00:34:29 2010 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : b3c7801c - correct Events : 148755 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 0 8 17 0 active sync /dev/sdb1 0 0 8 17 0 active sync /dev/sdb1 1 1 8 33 1 active sync /dev/sdc1 2 2 8 49 2 active sync /dev/sdd1 3 3 8 65 3 active sync /dev/sde1 trinitronx@saturn:~$ sudo mdadm --examine /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 00.90.00 UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn) Creation Time : Fri Jan 9 03:40:39 2009 Raid Level : raid5 Used Dev Size : 732571904 (698.64 GiB 750.15 GB) Array Size : 2197715712 (2095.91 GiB 2250.46 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Thu Jul 1 00:34:29 2010 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : b3c7802e - correct Events : 148755 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 1 8 33 1 active sync /dev/sdc1 0 0 8 17 0 active sync /dev/sdb1 1 1 8 33 1 active sync /dev/sdc1 2 2 8 49 2 active sync /dev/sdd1 3 3 8 65 3 active sync /dev/sde1 trinitronx@saturn:~$ sudo mdadm --examine /dev/sdc1 /dev/sdc1: Magic : a92b4efc Version : 00.90.00 UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn) Creation Time : Fri Jan 9 03:40:39 2009 Raid Level : raid5 Used Dev Size : 732571904 (698.64 GiB 750.15 GB) Array Size : 2197715712 (2095.91 GiB 2250.46 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Thu Jul 1 00:34:29 2010 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : b3c78040 - correct Events : 148755 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 2 8 49 2 active sync /dev/sdd1 0 0 8 17 0 active sync /dev/sdb1 1 1 8 33 1 active sync /dev/sdc1 2 2 8 49 2 active sync /dev/sdd1 3 3 8 65 3 active sync /dev/sde1 trinitronx@saturn:~$ sudo mdadm --examine /dev/sdd1 /dev/sdd1: Magic : a92b4efc Version : 00.90.00 UUID : 7a0e5ba8:669595fc:852484a6:e390a598 (local to host saturn) Creation Time : Fri Jan 9 03:40:39 2009 Raid Level : raid5 Used Dev Size : 732571904 (698.64 GiB 750.15 GB) Array Size : 2197715712 (2095.91 GiB 2250.46 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Update Time : Thu Jul 1 00:34:29 2010 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Checksum : b3c78052 - correct Events : 148755 Layout : left-symmetric Chunk Size : 64K Number Major Minor RaidDevice State this 3 8 65 3 active sync /dev/sde1 0 0 8 17 0 active sync /dev/sdb1 1 1 8 33 1 active sync /dev/sdc1 2 2 8 49 2 active sync /dev/sdd1 3 3 8 65 3 active sync /dev/sde1 trinitronx@saturn:~$ sudo mdadm --examine /dev/sde1 mdadm: No md superblock detected on /dev/sde1.