SEAGATE Video 3.5-Inch 4 TB 5900 RPM 64 MB Cache Internal Drive ST4000VM000 Optimized for high-definition consumer DVR applications Low power and fine-tuned for consistent, dependable delivery of multiple high-definition video streams Designed to meet Energy Star and other strict consumer power consumption standards Quiet drive operation to enhance customer viewing and listening experiences Easy-to-manage multi-room video delivery of up to 16 simultaneous HD streams Qualified for operating temperatures up to 75 Degree to meet the rigors of the consumer electronics set-top box market 24x7 operational profile to meet the always-on demands on the DVR market