WD Red SA500 4 TB (WDS400T2R0A)

WD Red SA500 is a line of SATA SSDs designed for NAS systems, specifically engineered for around-the-clock operation, caching, durability, and stable performance in multi-user scenarios. The series is available in two form factors: 2.5"/7 mm and M.2 2280, allowing the drives to be used for both upgrading existing NAS systems and building new installations with various configurations. These drives operate via a SATA III 6 Gbps interface and offer capacities ranging from 500 GB to 4 TB depending on the model, with the maximum 4 TB capacity available in the 2.5-inch variant. WD Red SA500 delivers sequential read speeds of up to 560 MB/s and write speeds of up to 530 MB/s, while random operation performance reaches 95,000 IOPS for reads and 85,000 IOPS for writes. For NAS workloads, reliability metrics are equally important: endurance ranges from 350 to 2,500 TBW depending on capacity, and the specified MTTF reaches up to 2 million hours. The drives are built on 3D NAND technology and optimized for OLTP databases, photo processing, 4K/8K editing, and fast access to frequently used files in storage systems. WD Red SA500 operates in a temperature range of 0 to +70 °C, supports 24/7 operation mode, and is designed for those who need a NAS-oriented SATA SSD built to handle continuous workloads rather than a standard consumer drive without consideration for persistent demands.