Okay, did a lot of digging around and I found a few things. Checked /etc/mdadm.conf and found that it had the old data for a previous RAID and not the current info. Corrected the devices and changed the UUID from the output shown from running 'mdadm --detail /dev/md0'. dmesg shows the following; SCSI device sdb: 145226112 512-byte hdwr sectors (74356 MB) SCSI device sdb: drive cache: write back SCSI device sdb: 145226112 512-byte hdwr sectors (74356 MB) SCSI device sdb: drive cache: write back sdb: sdb1 Attached scsi disk sdb at scsi2, channel 0, id 0, lun 0 Attached scsi generic sg1 at scsi2, channel 0, id 0, lun 0, type 0 Vendor: ATA Model: WDC WD740GD-50FL Rev: 31.0 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sdc: 145226112 512-byte hdwr sectors (74356 MB) SCSI device sdc: drive cache: write back SCSI device sdc: 145226112 512-byte hdwr sectors (74356 MB) SCSI device sdc: drive cache: write back sdc: sdc1 Attached scsi disk sdc at scsi3, channel 0, id 0, lun 0 Attached scsi generic sg2 at scsi3, channel 0, id 0, lun 0, type 0 Vendor: ATA Model: WDC WD740GD-50FL Rev: 31.0 Type: Direct-Access ANSI SCSI revision: 05 SCSI device sdd: 145226112 512-byte hdwr sectors (74356 MB) SCSI device sdd: drive cache: write back SCSI device sdd: 145226112 512-byte hdwr sectors (74356 MB) SCSI device sdd: drive cache: write back sdd: sdd1 Attached scsi disk sdd at scsi4, channel 0, id 0, lun 0 Attached scsi generic sg3 at scsi4, channel 0, id 0, lun 0, type 0 However, upon bootup the following info scrolls by; md: md0 stopped Initializing Multiple Devices mdadm: no device found for /dev/md0 md: Auto detecting RAID arrays md: autorun md: ..autorun done. mount: /dev/md0: can't read superblock Although, after logging in and running 'mdadm --assemble --scan' the RAID starts and it can be mounted. Fdisk shows all three drives with an ID of 'fd', for a Linux RAID Autodetect. Any ideas on how I can have device md0 start at boot time? Many thanks, James James