Western Digital Purple HDD 4TB Surveillance Hard Disk Drive – 5400 RPM Class SATA III 6 Gb/s 64MB Cache 3.5 Inch – (PVR, DVR, NVR and IPTV) Heavy Duty 24 – WD40PURX

Expert Features Digital Storage Capacity : 4000 GB Hard Disk Interface : Serial ATA-600 Connectivity Technology : SATA Brand : Western Digital Special Feature : Portable Hard Disk Form Factor : 3.5 Inches Hard Disk Description : Mechanical Hard Disk Compatible Devices : Desktop Installation Type : Internal Hard Drive Type : Purple 4TB Capacity, Intellipower 5400RPM Rotation Speed, 64MB Cache, 3 year limited warranty 3.5″ Internal Hard Drive, SATA III 6.0Gb/s, Lower Power & Heavy Duty 24/7(24 hour / 7 day) For Surveillance, set-top boxes (PVR, DVR, NVR and IPTV), media servers and media centers. Reduces video frame loss with surveillance-class storage. Specifically tuned for surveillance security systems. Caching algorithms are tuned for write-intensive, low bit rate, high stream count applications that are typical of surveillance applications. Priority change for write allocations and preemptive caching policies. Condition New Storage Size 4.0 TB Interface 3.5″ SATA III RPM 5400 BUS Speed 6Gb/s Size 3.5″ Inch Ports # 1 Port Port Type & Size SATA 3.5″ Color Silver , Black , Violet / Purple