Overview: The 8TB 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 8TB hard drive can hold a large amount of data and gives you the ability to easily upgrade and expand your security system. Built for always-on surveillance storage applications AllFrame technology for reduced pixilation and video interruption Designed to support up to 32 HD cameras Caching algorithms specifically designed for security surveillance operation 8 TB capacity holds up to 1,600,000 digital photos, 2,000,000 MP3 files, and 960 hours of HD video. Specifications: 8TB Storage Capacity 5400 RPM Class Load/unload cycles: 300000 Annualized workload rating: 180TB/yr 3.5 Form Factor 6 Gb/s Data Transfer Rate 128MB Cache Surveillance Class Storage Supports up to 32HD Surveillance Cameras