WD Elements Desktop storage with USB 3.0 offers reliable, high-capacity, add-on storage, ultra-fast data transfer rates, universal connectivity, and up to 5 TB capacity. Includes a free trial of WD SmartWare Pro automatic backup software. Type: Hard drive - external ( desktop ) Capacity: 4 TB Interface: USB 3.0 Data Transfer Rate: 5.0 Gbps (USB 3.0) Features: NTFS formatted Power Source: Included AC adapter Dimensions (WxDxH): 1.9 in x 5.3 in x 6.5 in Weight: 33.51 oz Localization: Canada, Latin America, United States Microsoft Certification: Compatible with Windows 7 Manufacturer Warranty: 1 year warranty Device Type: Hard drive - external ( desktop ) Capacity: 4 TB Interface: USB 3.0 Features: NTFS formatted Width: 1.9 in Depth: 5.3 in Height: 6.5 in Weight: 33.51 oz Interface Transfer Rate: 5.0 Gbps (USB 3.0) Interfaces: 1 x USB 3.0 Power Source: Included AC adapter Power Device: Power adapter Voltage Required: AC 120/230 V ( 50/60 Hz ) Software Included: WD SmartWare Pro (30 days trial) OS Required: Apple MacOS X 10.7 Lion, Apple OS X 10.8 Mountain Lion, Microsoft Windows Vista / XP / 7 / 8, Apple OS X 10.9 Mavericks Cables Included: 1 x USB cable - external Compatible with Windows 7: Compatible with Windows 7 software and devices carry Microsoft’s assurance that these products have passed tests for compatibility and reliability with 32-bit and 64-bit Windows 7. Compliant Standards: Plug and Play, RoHS Localization: Canada, Latin America, United States Service & Support: Limited warranty - 1 year Min Operating Temperature: 41 °F Max Operating Temperature: 95 °F