The Western Digital WD Purple 8TB WD85PURZ hard drive is a high-capacity internal desktop drive designed for 24/7 systems. With a rotation speed of 5400 RPM and a cache size of 256 MB, this SATA III drive provides fast read speeds up to 210MB/s and transfer rates of 6 Gbps. The drive is compatible with PC systems and comes in a 3.5-inch form factor with a unique purple and silver color design. Backed by a 3-year manufacturer warranty, the WD Purple drive is ideal for storing large amounts of video footage, making it perfect for surveillance systems or other demanding storage needs.