have a question. I have a WD MC EX2100 (2x4TB)in RAID 1. Now I´m running out of space so I´m wondering how to upgrade the HDD from 4 TB into 6TB without loosing my original data. I was thinking that since in RAID 1 more the data are mirrored I can maybe replace one of the 4TB HDD(let´s say from slot 2) and put the new 6TB HDD into slot. The unit will restore the RAID 1 and so copy all the date from slot 1 into slot 2 right ?Once this done I can maybe replace the HDD from slot 1 also with new 6TB HDD and the proces will run again to restore RAID 1. Question is how to use all 2x6TB capacity since tha original RAID was created for 2x4TB. Can someone help ?