Cannot start array or do parity swap after failed data drive in General Support Posted April 7 On 4/4/2022 at 9:38 PM, itimpi said: At this point I would suggest you use the New Config tool and use it to set up the array without disk1 or disk3, and build new parity based on those drives. You could also take the opportunity to add another drive at this point if you so desire (perhaps to hold any data you can recover from disk1). At that point you would have the array in a protected state, albeit without the data from the ‘failed’ disk1. in terms of recovering data off disk1 then I suggest trying disk recovery software such as UFS Explorer on Windows to see if it can recognise any data on the old disk1. UFS Explorer is not free but you only have to pay for it if you want to actually recover data - not if simply scanning the drive to see if it will be able to recover any data on the paid-for version. There may be other free tools that can also do this, but UFS Explorer is the only one I have personal experience of (and have paid for). However if the drive really has physically failed then such software will not be able to do anything with it. You may want to wait a while to see if anyone else chimes in with some way forward that I have not thought off. Thanks again. You were very helpful! After tingling around for hours I managed to get Drive 1 to work again, I had to connect the disk upside down and with some duck tape to connect the power connector. It's not stupid if it works right? 😏 (The entire plastic casing around the power connector is gone because I dropped it long time ago while connected.. Not recommended) I started a new config as you advised, with the 'old' data drive connected and the bigger (18TB) as parity drive. After about 32 hours it completed! It was a hard lesson to learn not to have unnassigned drives in my setup and to solve this in the setup before other problems arise. I never thought this would be a problem with only 1 parity drive. Now I now better.