If 1 and 2 were set in array and not as individual that would explain the problem there since an array is made up of two identical drives. 3 and 4 are for creating a second array if not individual there. This may be the reason why they both didn't work together with the 400gb on #2. A possible size limitation for 1+2 would also explain this. Look over the manual or support site on this.
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