The 1TB Purple Surveillance Internal Hard Drive from Western Digital is designed to withstand the stresses placed on it in a 24-7 surveillance system. With support for up to 32 high definition surveillance cameras this 4TB hard drive can hold a large amount of data and gives you the ability to easily upgrade and expand your security system. Features: - WD Purple Surveillance Storage is built for 24-7 always on surveillance in high definition security systems that use up to eight hard drives and up to 32 cameras. Exclusive AllFrame technology works with ATA streaming to reduce error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage insecurity systems. - WD Purple surveillance class storage has been tested to be compatible in a wide range of security systems. These drives are designed to replace standard desktop drives that were not designed for the harsh 24-7 always-on, high definition surveillance environment. - Surveillance storage for peace of mind - WD Purple Surveillance Hard Drives are designed for high temperature, always on, surveillance security systems to ensure reliability and quality video play back when you need it most. - Improve performance with AllFrame - WD Purple

class hard drives are equipped with AllFrame technology which works with ATA streaming to reduce frame loss, improve playback and increases the number of drive bays supported. - Engineered for compatibility - WD Purple surveillance hard drives are built for compatibility with industry leading chassis and chip set manufacturers for seamless integration into your new or existing video surveillance system. - Optimized performance for up to 32 HD cameras - WD Purple hard drives are optimized to support up to 32 high-definition surveillance cameras. - Lower power consumption - With exclusive IntelliSeek technology, WD Purple drives calculate the optimum seek speeds which lowers power consumption, noise and vibration that can damage and cause drives to wear out more quickly. Specifications: - Weight: 748 Grams - Dimensions: 15cm x 10.5cm x 2.5cm - Device Type: Hard drive - internal - Capacity: 1TB - Form Factor: 3.5" - Interface: Serial ATA-600 - Buffer Size: 64 MB - Drive Transfer Rate: 600 MBps (external) - Internal Data Rate: 110 MBps