0B47749 WD Ultrastar DC HC555 20TB SAS 512 MB 3.5" Server HDD

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Product line:

Ultrastar

See all Enterprise SAS HDDs

See other WD products

€892.42

In stock

Happyware Article Number:

SH9H5455-689300

Manufacturer Number:

0B47749

Brand:

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Description Technical details Warranty & Technical Support Reviews Bulk Deals

0B47749

High-Density 3.5in Enterprise SAS HDD for Nearline Data Lakes with the 0B47749

The 0B47749 is a 20TB 3.5in internal enterprise HDD engineered for high-capacity tiering in servers and JBOD enclosures where predictable latency and sustained throughput matter more than flash-class IOPS. Built on a 12Gb/s SAS single-port architecture, the 0B47749 integrates cleanly into dual-controller storage backplanes and HBA-based platforms that require deterministic link behavior and enterprise error recovery characteristics.

For data-centre operators balancing capacity per rack unit with operational consistency, the 0B47749 uses CMR media with EAMR technology to maintain performance under mixed sequential and random access patterns common in object stores and distributed file systems. A 7200 RPM spindle and 512MB cache support large streaming transfers, while the 512e sector format helps maintain broad OS and RAID compatibility. Rotational vibration sensing improves stability in dense multi-drive chassis, and the design target of continuous 24x7 duty enables reliable scale-out expansion and predictable rebuild windows.

Why Choose the 0B47749?

The 0B47749 is optimized for capacity-driven architectures that must scale linearly without increasing administrative risk. With a high density-to-power profile and enterprise reliability design goals, the 0B47749 supports consistent fleet behavior across large deployments, simplifying qualification, sparing strategy, and lifecycle planning for nearline tiers.

WD designs Ultrastar datacenter drives around controlled manufacturing processes and workload-informed firmware tuning. The 0B47749 reflects this engineering focus with durability for continuous operation, platform-friendly SAS integration, and features aligned with modern storage governance, including Secure Erase for decommissioning workflows.

Key Applications:

High-density nearline storage for servers and JBODs
Backup and archive repositories
Scale-out object storage nodes
Distributed file storage nodes
Workstation high-capacity datasets

At Happyware - Server Hardware you benefit from non-binding offers tailored to your storage platform and rollout scope, and from extended warranty options up to 6 years to align drive coverage with enterprise refresh cycles.

Technical details of 0B47749

Capacity:

20TB

Form Factor:

3.5"

Interface Speed:

SAS

Rotations:

7200RPM

Cache:

512 MB

Noise Level Operation:

20dB

Noise Level Idle:

20dB

How long is the Warranty and how you can get technical support for 0B47749

Warranty:	12 months (part)
RMA Url:	https://support-de.wd.com/app/rmastatus/
Description:	The item must be returned first for evaluation; if deemed defective, a replacement will be shipped. No guaranteed delivery times are offered