RAID 0, 1, and 5 are part of the Flex-RAID RAID levels. If you want to switch from this mode to X-RAID (expandable RAID), you will need to backup your data first, and then perform a factory default. During the factory default process, there will be a 10-minute window during the boot where you can use RAIDar to click the Setup and set the box to the desired RAID mode (Flex-RAID or X-RAID). RAIDar will prompt with “Click Setup” during this 10-minute period.
Please refer to the ReadyNAS Software Manual for detailed information.