Seagate 4TB SkyHawk 3.5” SATA Surveillance Video Hard Drive, CMR, 256MB CacheSkyHawk leverages Seagate’s extensive experience in designing drives purpose-built for surveillance applications.Features:ImagePerfect firmware is designed to ensure seamless video footage capture in 24×7 surveillance workloads that record video from 64 HD cameras.SkyHawk Health Management actively helps protect your surveillance storage by focusing on prevention, intervention, and recovery options. Included is RAID Rapid - Rebuild , which provides 3x faster volume rebuilds over traditional RAID rebuilds. - Unparalleled data protection with included 3-year Rescue Data Recovery Services plan, helping protect important video data with Seagate’s in-house data recovery services. - Lower power consumption means a reduction in heat emissions, which improves reliability in surveillance solutions. Tarnish-resistant components help protect drive from environmental elements, increasing field reliability. - Specifications:Capacity :4 TBDimensions H x W x D :20.20 mm/0.795 in x 101.6 mm/4.0 in x 146.99mm/5.787in - Weight :630 g/1.389 lb