I have a two-disk RAID0 system that is working splendidly, thanks to the list for the help. I managed to get my hands on more identical disks and since I have the disks and because I'm adding precious data, I'd like to add two more disks and grow to RAID5. I have partitioned the two new drives to type 'fd', /dev/sde and /dev/sdf I believe the command to accomplish the change is this: mdadm /dev/md0 --grow --level=5 --add /dev/sde /dev/sdf Following the old adage "measure twice, cut once", is this syntax correct? Is there any danger of data loss in such a conversion? Thanks Mike-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html