Iomega 500GB StoreCenter Pro 250d Series. Processor family: Intel Celeron, Processor clock speed: 3.2 GHz. Total storage capacity: 500 GB, Hard drive capacity: 250 GB, Hard drive rotational speed: 7200 RPM. Internal memory: 0.5 GB, Internal memory type: DDR2. Compliance industry standards: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, Supported network protocols: TCP/IP, AppleTalk, IPX, NetBEUI, Data transfer rate (max): 1000 Mbit/s. Bundled software: eTrust Antivirus 7.1 Iomega NAS Discovery Software EMC Retrospect Express