WDS400T1R0A WD Red 4TB SATA 2.5" NAS SSD

High-Performance 2.5-inch SATA NAS SSD featuring 3D TLC with SLC caching with the WDS400T1R0A

The WDS400T1R0A is a 4TB internal SATA SSD engineered as an always-on performance tier for NAS platforms where storage latency, metadata access, and read-cached volumes drive overall service responsiveness. In typical small business and edge NAS designs, the WDS400T1R0A improves I/O consistency for virtualized file services and mixed block workloads while maintaining compatibility with standard 2.5-inch SATA bays and SATA controllers.

Built on 3D TLC NAND with SLC caching, the WDS400T1R0A sustains strong sequential throughput and responsive 4K access patterns, supporting metadata acceleration and SSD tiering without requiring PCIe/NVMe backplanes or additional PCIe expansion. This architecture fits environments where the CPU platform and memory footprint are optimized for storage services rather than compute, and where SATA delivers predictable integration across RAID/HBA configurations. With a 5-year endurance profile, high MTBF, and low idle power draw, the WDS400T1R0A is suited for dense NAS nodes that must balance performance per bay with operational efficiency.

Why Choose the WDS400T1R0A?

Choosing the WDS400T1R0A provides a practical density-to-performance upgrade path for SATA-based NAS fleets, enabling SSD-tier capacity without redesigning chassis, backplanes, or controller strategy. The WDS400T1R0A supports scalable rollouts across branch, edge, and centralized NAS, aligning with 24x7 duty cycles and minimizing risk during phased migrations from HDD-only tiers.

WD designs NAS-class SSDs with a focus on sustained reliability, predictable behavior under continuous operation, and broad interoperability with common storage stacks. The WDS400T1R0A reflects this engineering approach by combining endurance management, power efficiency, and a form factor that integrates cleanly into modern data centre and remote-site standards.

Key Applications:

• NAS SSD tiering
• Read caching and metadata acceleration
• Small business file and collaboration services
• Edge/branch storage refresh
• Virtualization datastores on SATA NAS

At Happyware - Server Hardware you benefit from non-binding offers tailored to your deployment scope for the WDS400T1R0A, and you can extend the warranty up to 6 years to protect long-lived NAS refresh cycles.