The WD Purple WD101PURZ 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive is a high-capacity internal hard disk drive designed for use in computing systems. With a storage capacity of 10TB, this Western Digital hard drive offers reliable and fast data access through its SATA III interface. The drive features a 7200 RPM rotation speed and a 256MB cache, ensuring efficient performance for a variety of storage needs. Its purple color and WD Purple product line indicate that it is specifically designed for demanding applications like surveillance systems, making it a practical choice for businesses or individuals requiring large amounts of data storage.