WD My Cloud EX4 Personal Cloud Storage - 2 GHz - 4 x Total Bays - 512 MB RAM - RAID Supported - 3 x USB Ports WD WDBWWD0000NBK-NESN My Cloud EX4 4Bay Network Attached Storage 512MB RAM Diskless Manufacturer & Manufacturer: Western Digital WDBWWD0000NBK-NESN