0F38351 WD Ultrastar DC HC550 18TB SAS 512 MB 3.5" Server HDD

High-Capacity 3.5in SAS Datacenter HDD for nearline storage tiers with the 0F38351

The 0F38351 is a WD Ultrastar DC HC550 18TB 3.5in internal SAS HDD designed for scale-out server storage where predictable throughput and sustained duty cycles matter more than low-latency flash. In dense JBODs, storage nodes, and backup targets, the 0F38351 supports capacity expansion without changing the CPU platform, while SAS connectivity aligns with enterprise backplanes, dual-path architectures, and HBA-based manageability.

With 7200RPM mechanics and a 512MB cache, the 0F38351 is engineered for consistent streaming and mixed sequential I/O patterns typical of object/file capacity tiers. The 0F38351 supports 4Kn with 512e compatibility to simplify integration across modern OS and RAID stacks, reducing sector-format friction during refresh cycles. Helium-filled construction and 24x7 design targets efficiency and acoustics in high-bay deployments, while Instant Secure Erase (ISE) enables controlled decommissioning workflows within regulated environments.

Why Choose the 0F38351?

The 0F38351 delivers a high density-to-slot ratio for bulk storage pools, enabling more usable capacity per rack unit while preserving standard 3.5in serviceability. In distributed storage and backup architectures, the 0F38351 supports scalable growth, predictable rebuild behavior, and enterprise reliability characteristics aligned to continuous operation and operational risk reduction.

WD designs Ultrastar platforms around datacenter qualification, longevity metrics, and consistent firmware behavior under sustained load. The engineering focus is on integration with enterprise SAS ecosystems, controlled power profiles, and lifecycle tooling that fits modern operational standards for secure handling, monitoring, and fleet refresh planning.

Key Applications:

• High-capacity server storage
• Backup and archive repositories
• Scale-out object storage capacity tiers
• Scale-out file storage capacity tiers

At Happyware - Server Hardware you benefit from non-binding offers tailored to your storage node, JBOD, or backup repository requirements and bulk order discount options for standardized rollouts of the 0F38351 across larger fleets.