Ex 2 ultra dont recognize disc with solid red

I have in my ex2 ultra 2 wd red 3tb both are fine and full function on the bay 1 but when I put a disc in the 2 bay it shows a red solid color, I repeat is not the disk I try changin it but nothing happends, in the control panel it shows degraded but it is not what can I do? I have all ready restore factory settings etc

Did you actually try rebuilding your uni or changing RAID modes for testing? A factory reset will not affect the RAID level unless it’s a full restore.

If you are unable to rebuild, or if the error persists then it could be a hardware fault with NAS itself and would need to be replaced.