NAS with 2 drive bays. Realtek RTD1619B quad-core processor at 1.7 GHz. 1 GB DDR4 RAM. Suitable for 2.5"/3.5" hard drives. Includes 16 TB (2x 8 TB) Seagate Ironwolf HDDs pre-installed. NAS with 1 RJ-45 port. RAID: Yes. The DS223j is an efficient all-in-one solution for storing and sharing your data. With two drive bays and Synology DiskStation Manager (DSM), you can create a private cloud with the DS223j to protect your files, access your data across multiple devices, and store backups using intelligent video surveillance tools.