Hardware Specifications CPU CPU Model Marvell Armada 385 88F6820 CPU Architecture 32-bit CPU Frequency Dual Core 1.8 GHz Hardware Encryption Engine Memory System Memory 1 GB DDR3 Storage Drive Bays 4 Maximum Drive Bays with Expansion Unit 8 Compatible Drive Type* (See all supported drives) 3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD Maximum Internal Raw Capacity 48 TB (12 TB drive x 4) (Capacity may vary by RAID types) Maximum Raw Capacity with Expansion Units 96 TB (48 TB + 12 TB drive x 4) (Capacity may vary by RAID types) Maximum Single Volume Size 16 TB Hot Swappable Drive Notes "Compatible drive type" indicates the drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay. The maximum raw model : ADATA XPG SX6000 Lite 512GB PCIe 3D NAND PCIe Internal Solid State Drive tag : NAS