0B48723 WD Ultrastar DC HC555 18TB SATA 512MB 3.5" Server HDD

High-Capacity 3.5" Datacenter SATA Nearline HDD engineered for scale-out storage with the 0B48723

The 0B48723 is a Western Digital Ultrastar DC HC555 18TB internal 3.5" enterprise HDD designed for nearline tiers where capacity density and predictable latency matter more than flash-class IOPS. Integrated into SATA storage backplanes and JBOD shelves, the 0B48723 supports large object repositories, backup targets, and archive pools while maintaining consistent 24x7 duty operation for always-on data services.

Architecturally, the 0B48723 aligns with modern scale-out storage nodes by combining 4Kn media with 512e emulation options to simplify OS and RAID controller interoperability. A 512MB cache supports sustained streaming patterns common in rebuilds, replication, and erasure coding. The 7200 RPM platform balances throughput with power efficiency, while enterprise mechanics such as RV sensors, a triple-stage actuator, and dynamic fly height control help maintain stability in dense multi-drive enclosures where vibration and thermal variation can impact performance.

Why Choose the 0B48723?

The 0B48723 provides a strong density-to-bay ratio for SATA-based capacity tiers, enabling higher usable TB per rack unit in RAID arrays and shared-nothing nodes. With datacenter-class reliability targets and a 2.5M-hour MTBF design point, it supports predictable scaling for growth-focused environments, from small expansion shelves to large Ceph/HDFS clusters, while keeping operational profiles consistent across mixed-drive populations.

Western Digital engineers the Ultrastar line for enterprise lifecycle requirements, emphasizing validated firmware behavior, mechanical robustness, and compatibility with standard datacenter storage architectures. This approach supports controlled deployment in RAID controllers, dense HDD shelves, and scale-out servers where sustained operation and serviceability are key.

Key Applications:

• Object storage capacity tiers
• Backup and archive repositories
• Ceph and HDFS storage nodes
• RAID arrays and JBOD expansion shelves

At Happyware - Server Hardware you benefit from non-binding offers tailored precisely to your storage rollout and platform requirements, helping you standardize the 0B48723 across nodes and shelves with procurement clarity. For long service-life deployments, you can also extend the warranty up to 6 years to protect your investment in high-capacity nearline storage.