2. Choose raid 5 from the settings and picked my three empty, un-partitioned drives. 3. It created a new multi disk array device md0 that was shown in the degraded state. 4. I clicked format volume, ...

Ok, I have a 1tb drive and will be adding another. Can I create an array with one empty and one with data? will it mirror the other? I know that raid does not = backup but raid 1 plus an external ...