i just forced a re-assemble ... and then it fixed it self mdm -A --force /dev/md0 /dev/hd[ijk]1 (forced re-assemble on the 3 good drives) mdm -a /dev/md0 /dev/hdl1 (re-added the bad drive and it fixed itself) - 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