MDD (MD16TBGSA25672DVR) 16TB 256MB Cache 7200RPM SATA 6.0Gb/s 3.5" Internal Hard Drive designed for heavy duty 24/7 operation. It is perfect for Surveillance System, CCTV DVR & Desktop computers (PC/MAC). The MaxDigitalData 16TB hard drive provides an enormous 16TB capacity, 256MB Cache and 7200rpm rotation speed to deliver a greater level of power efficiency and quiet operation for energy-conscious, environmentally-friendly computers. 16TB of capacity to store up to 16,000 hours of HD video (depends on CCTV System.) Built for Surveillance system Heavy workloads? No problem. Smooth Video record & playback always Designed for heavy duty 24×7 operation