WD Purple HDD 1TB Surveillance Hard Disk Drive Expert Features Digital Storage Capacity : 1 TB 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 : Laptop Installation Type : Internal Hard Drive Engineered specifically for surveillance security systems Reduced video frame loss Tuned for write-intensive, low bit-rate, high stream-count applications typical to most surveillance applications Prioritized write-operations for maximized surveillance performance TLER & ATA streaming support. Package includes a hard drive only – no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary. From the manufacturer Benefits of AllFrame Technology Reduces frame loss Improves video playback Optimizes the HDD to thrive in high temperature, always-on, surveillance system environments Protect your home and business with WD Purple surveillance hard drives WD Purple surveillance storage is built to handle up to 32 HD cameras per drive and is designed for 24/7, always on, high-definition surveillance security systems that use up to eight hard drives. Available in up to 8 TB capacities SATA 6 Gb/s interface and 64MB cache Optimized with AllFrameTM Technology Surveillance 3.5-inch Hard Drive 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 With support for up to 32 high-definition surveillance cameras per hard drive, WD Purple gives you the flexibility to upgrade and expand your security system in the future. 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.