Just to be clear: You have two current drives in RAID that you want to convert to some other configuration, or you currently have one drive and you want to make sure a second is used independently, not in RAID? And you have the original Duo, or a DuoV2?
Neither of the above conversions is directly supported in the GUI -- you must choose between XRAID (which always uses a second drive as RAID) or FlexRAID (which gives you options) at the time you initially create the volume. OS6 added a switch to the GUI, but earlier OSes did not have that option. Neither provides a method to "un-RAID" and keep the data.
So, the "approved" way is to back up the data, destroy the volume, and create a new FlexRAID one. But perhaps somebody has discovered a "back door" way to change that via SSH in the older versions as I have posted for OS6.
So, the "approved" way is to back up the data, destroy the volume, and create a new FlexRAID one. But perhaps somebody has discovered a "back door" way to change that via SSH in the older versions as I have posted for OS6.
Actually with the Duos (both v1 and v2) you need to do a factory reset. There's a 5-10 minute countdown after the reset when you can switch to flexraid using RAIDar 4.3.8. ( https://kb.netgear.com/20684/ReadyNAS-Downloads#raidar ) The reset will also destroy your ability to connect with https (whether you use the add-on for the v2 or modifying virtual.conf). So you'd need to have an old browser already at hand - either internet explorer, or an old version of firefox.
So really messy. If you need more capacity it might be time to get a new NAS.
