Seagate Skyhawk 4TB Video Internal Hard Drive HDD – 3.5 Inch SATA 6Gb/s 64MB Cache for DVR NVR Security Camera System with Drive Health Management and in-House Rescue Services 

• Built for video DVR and NVR security camera systems, SkyHawk delivers video-optimized storage
• Support workloads of up to 180TB/year—that's 64 simultaneously streaming HD cameras with zero dropped frames
• Built-in RV sensors allow drives to maintain performance in multi-bay systems, offering the flexibility to scale systems when more storage is needed
• Lower power consumption reduces heat emissions and improves reliability—plus, drives can easily be monitored with SkyHawk Health Management
• Enjoy long-term peace of mind with 1M hours MTBF, an included three-year limited warranty, and three-year in-house Rescue Data Recovery Services