0B47741 WD Ultrastar DC HC555 12TB SAS 512 MB 3.5" Workstation HDD

High-Performance 3.5" Enterprise SAS HDD for always-on capacity tiers with the 0B47741

The 0B47741 is a 3.5" internal WD Ultrastar DC HC555 enterprise HDD designed for dense server and workstation bulk storage, delivering predictable throughput over a SAS single-port interface in 24/7 datacentre duty cycles. With 12TB capacity at 7,200 RPM and a 512MB cache, the 0B47741 supports large sequential streams and sustained reads up to 1.2 GB/s, aligning well with backup windows, content repositories, and scale-out nodes where cost-efficient capacity is the architectural priority.

Optimised for platform integration, the 0B47741 uses a 512e sector format to simplify interoperability with legacy stacks while maintaining 4Kn-class formatting behavior through 512-byte emulation. Its EAMR + TDMR recording stack, Triple Stage Actuator, and Rotational Vibration Safeguard are engineered to protect performance consistency in multi-drive backplanes, reducing latency variance under vibration and high queue depths typical of SDS and OCP 2.0 environments.

Why Choose the 0B47741?

The 0B47741 provides a balanced density-to-performance profile for enterprise capacity tiers, pairing SAS attachability with mechanical stability features that help sustain aggregate throughput at rack scale. Rated at 2.5M hours MTBF with Secure Erase support, the 0B47741 is suited for standardised fleets where serviceability, predictable power behaviour (5.4W idle, 8.8W operating), and consistent firmware-driven operation are essential for long-life deployments.

WD designs Ultrastar platforms around datacentre reliability disciplines, focusing on controlled acoustics, vibration tolerance, and media management to meet modern server thermal and airflow constraints. For architects standardising storage tiers, the 0B47741 aligns with operational models that prioritise uptime, capacity efficiency, and validated integration in enterprise backplanes.

Key Applications:

• Scale-out software-defined storage capacity nodes
• OCP 2.0 storage sleds and dense JBOD shelves
• Backup, archive, and compliance repositories
• Virtualisation cold data tiers
• Media and content libraries

At Happyware - Server Hardware you benefit from Non-Binding Offers tailored to your storage tier design and procurement timelines, and you can secure your investment with an Extended Warranty up to 6 years for long-running datacentre deployments.