The Western Digital 8TB WD Purple Surveillance Internal Hard Drive is a high-performance hard drive designed specifically for surveillance systems. With a data transfer rate of 6.0 Gb/s and a cache size of 256 MB, this SATA 6 Gb/s hard drive offers fast read and write speeds for efficient data storage and retrieval. The 8TB storage capacity provides ample space for storing a large amount of video footage, making it ideal for use in business environments. With a rotation speed of 5400 RPM and a durable aluminum and glass construction, this Western Digital hard drive is a reliable choice for surveillance system needs.