The WD Red Plus series is designed for small and medium-sized businesses and is available for small to medium-sized NAS environments with up to 8 bays. WD Red Plus drives are designed to handle increased workloads in your business. They have undergone extensive testing and are backed by a three-year limited warranty. Key Features • Capacity: 4 TB • Interface: SATA III (6 Gb/s) • Disc rotation speed: 5400 rpm • Cache: 256 MB • Disc format: 3.5" • Maximum annual load 180 TB • CMR recording technology