Assumption: Assume to have only one drive with several raid one partitions. Steps: 1. Make sure to boot from some usb live OS (i.e. CentOS Live OS 5.2 under USB) 2. Use mdadm –remove to remove ALL raid one partitions (i.e., mdadm /dev/md0 –remove Uninstall software raid one for linux drive with data intact 29 June 2009 mdadm