WD My Cloud Mirror Personal Cloud Storage 4TB (8.9 cm (3.5 inch), dual-drive NAS) (Accessories)
Technical descriptions are here to suffice the need not to ausfuehen again. I have bought this NAS following reasons: 1. he is RAID-1 capability, and my old NAS had only one plate, and has re-formatted by a hardware defect, the plate ... all lost ...