WD Purple Internal Hard Drive, 4TB, 3.5 Inch, SATA 6Gb/s, 5400 RPM Class, 256MB Cache

The WD Purple is a 4TB internal hard drive made for surveillance systems. It suits DVR and NVR recorders that record video 24/7. The drive uses the 3.5-inch size with a SATA 6Gb/s interface, runs in the 5400 RPM class and has 256MB of cache, with a transfer rate of up to 175 MB/s. It uses WD AllFrame technology to help reduce lost video frames and has a workload rating of 180 TB per year. The drive fits a standard 3.5-inch bay and connects with SATA data and power cables. It measures L 147 × W 101.6 × H 26.1 mm and weighs 570 g. Made in Thailand, with a 3-year limited warranty from Western Digital.