WD Ultrastar DC HC560 20TB Enterprise HDD 0F38651

Brand: Western Digital | Category: Enterprise HDDs

SKU: 0F38651 | Part #: 0F38651 | MPN: WUH722020BL

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The WD Ultrastar DC HC560 20TB (part number 0F38651) is built for environments where capacity and power efficiency matter more than raw speed. With a 512MB cache buffer and sustained transfer rates in the 272 MB/s range, this drive positions itself squarely in the backup, cold NAS, and archive tier space rather than competing for hot-tier or transactional workloads. That cache size and throughput profile tells you immediately what Western Digital designed this for: sequential read-write operations on large files, not the kind of random I/O that keeps active databases awake.

The mechanical foundation here is solid without being exotic. Nine platters spinning at 7200 RPM deliver an areal density of approximately 1,118 gigabits per square inch, which is where the industry stands for CMR drives in this capacity class. Western Digital uses OptiNAND technology alongside conventional magnetic recording to squeeze those extra terabytes onto the platter stack, and the HelioSeal helium-filled chamber reduces drag between the platters and the actuator arm. That design choice cuts power consumption during active read and write cycles to 7.2W typical—a real consideration when you're buying hundreds of these units for a warm archive or backup appliance. Even in standby, the drive idles at just 2.8W, which means your power budgets stay predictable even when drives cycle through idle periods.

Reliability metrics on the 0F38651 reflect its intended use case. The 2.5 million-hour MTBF and 550TB annual workload rating assume this drive will see steady but not brutal use. That one non-recoverable read error per 10^15 bits read is typical for enterprise drives at this tier and translates to negligible risk in arrays where data is already protected by RAID or erasure coding. Storage architects and sysadmins evaluating this drive for archive workflows should expect it to perform exactly as specified—no surprises, no firmware instability, just reliable sequential throughput over five to seven years of deployment. The 512e sector format ensures compatibility with modern systems while maintaining backward compatibility with legacy infrastructure that still expects 512-byte sectors.

The physical design suits standard 3.5-inch mounting trays and enclosures. At 650 grams and measuring 101.6 × 147 × 26.1 millimeters, the HC560 20TB fits density requirements for most backplane configurations without modification. Western Digital included ARSS (Automatic Rotational Vibration Safeguard) to compensate for vibration in multi-drive environments—important when you're packing dozens of spindles into a single appliance. Operating temperature tolerance spans 0 to 60 degrees Celsius, which covers most climate-controlled data centres and allows for some margin in passive cooling scenarios. The SATA 6 Gb/s interface is mature, widely supported, and not a bottleneck for sequential workloads; sustained throughput on this drive barely reaches 272 MB/s, well below the theoretical SATA ceiling.

Enterprise teams buying the WD Ultrastar DC HC560 20TB typically come from storage operations or infrastructure procurement, where the decision hinges on cost per terabyte and power efficiency rather than latency or IOPS. Network storage teams integrating these drives into NAS appliances care about the mechanical reliability and the thermal profile. Backup appliance builders appreciate that this drive won't generate excessive heat or consume power during idle phases. The part number 0F38651 appears on specification sheets for backup windows, compliance archives, and cold-tier expansion in tiered storage strategies. Western Digital has positioned the Ultrastar series specifically for these use cases, and the HC560 delivers without overselling performance it cannot sustain.

Storage Tier Positioning & Deployment Scenarios

• Rated for 550TB annual workload and 2.5 million-hour MTBF, suited for warm archive and cold backup tiers in tiered storage architectures
• 272 MB/s sustained throughput and 512MB cache optimized for sequential large-file operations, not random transactional I/O
• 7.2W active power consumption and 2.8W standby enables cost-effective scaling in high-capacity backup appliances and archive systems
• HelioSeal helium-filled design and OptiNAND recording technology deliver 20TB capacity on nine platters without thermal complexity
• SATA 6 Gb/s interface and 512e sector format ensure broad compatibility with legacy and modern NAS controllers, backup software, and archive appliances
• Automatic Rotational Vibration Safeguard (ARSS) compensates for multi-spindle environments typical in 42U and 45U appliance configurations
• Part number 0F38651 carries standard enterprise warranty and RoHS compliance for regulated environments across GCC and EMEA regions

Omnixon Global supplies the WD Ultrastar DC HC560 20TB and the full Ultrastar portfolio to data centres, backup service providers, and enterprise storage teams across the UAE, broader GCC, and into Asia and Europe. We maintain stock of high-capacity enterprise drives and coordinate logistics that respect the critical timelines of production rollouts and capacity expansions. For technical consultation, large-volume pricing, or integration into your storage architecture, contact our team to discuss your requirements and request a formal quotation.