CPU Intel Atom C2538 Quad Core 2.4GHz Hardware Encryption Engine Yes (AES-NI) Floating Point Unit Yes RAM Size DDR3 2 GB (Expandable up to 6 GB) Internal HDD/SSD 3.5” or 2.5” SATA(II) X 4 (hard drives not included) Maximum Internal Raw Capacity 24 TB (6 TB HDD X 4) (The actual capacity will differ according to volume types) Hot Swappable Drive Yes External Ports USB 3.0 ports X 2, eSATA X 1 Size (HxWxD) (mm) 44 X 430.5 X 591.8 Weight 9.36kg LAN Gigabit X 4