Back again ... :-) So far so good with building RAID1 arrays using the 'missing' device method on an already installed Slackware 9.1 system. I've set up the RAID devices, they are autodetected on boot, everything looks good. I hotadd the 'missing' device and the two devices sync. I run 'mdadm --detail /dev/md5' and yep, the full array is now running with both disks. I can 'ls' the contents etc. I reboot and ... back to degraded mode with one failed device. The hotadded device doesn't stick to the RAID device. I'm sure there is a simple explanation. One system complaint is that the expected superblock info couldn't be found (something like "expecting a2hgf64jdk found 00000000"). I'm not sure how to rectify this? Thanks Mick - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html