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 FeaturesDigital Storage Capacity : 4000 GBHard Disk Interface : Serial ATA-600Connectivity Technology : SATABrand : Western DigitalSpecial Feature : PortableHard Disk Form Factor : 3.5 InchesHard Disk Description : Mechanical Hard DiskCompatible Devices : DesktopInstallation Type : Internal Hard DriveType : Purple4TB Capacity, Intellipower 5400RPM Rotation Speed, 64MB Cache, 3 year limited warranty3.5″ 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.ConditionNewStorage Size4.0 TBInterface3.5″ SATA IIIRPM5400BUS Speed6Gb/sSize3.5″ InchPorts #1 PortPort Type & SizeSATA 3.5″ColorSilver , Black , Violet / Purple