Name: Western Digital Ultrastar DC HC570 20TB SATA 6 Gb/s - SunSpike
SKU: WUH722020CLE6L4

Product Overview: Western Digital Ultrastar DC HC570 20TB

The Ultrastar DC HC570 is an enterprise-class 20TB hard drive engineered for cloud and hyperscale data centers. Built on Western Digital’s 10-disk platform, it leverages HelioSeal® helium technology, ePMR (Energy-Assisted PMR), a Triple-Stage Actuator (TSA), and OptiNAND™ technology to maximize capacity, power efficiency, and performance reliability.

Key Specifications

Feature	Specification
Model Number	`WUH722020CLE6L4`
Capacity	20 TB
Form Factor	3.5-inch Enterprise
Interface	SATA 6 Gb/s
Format / Sector Size	512e (512-byte Emulation)
Rotational Speed	7,200 RPM
Cache (Data Buffer)	512 MB
Recording Technology	ePMR (Energy-Assisted Perpendicular Magnetic Recording)
Architecture	OptiNAND™ Enabled + HelioSeal® (Helium-filled)

Performance & Transfer Rates

Sustained Transfer Rate (Max): 291 MB/s (277 MiB/s)
Interface Transfer Rate: Up to 600 MB/s (SATA 6Gb/s max burst)
Areal Density: 1,108 Gb/sq.in
Average Latency: 4.16 ms

Reliability & Endurance

Mean Time Between Failures (MTBF): 2.5 Million Hours
Annualized Failure Rate (AFR): 0.35%
Workload Rating: Up to 550 TB / year
Non-Recoverable Read Error Rate: 1 sector per $10^{15}$ bits read
Load / Unload Cycles: 600,000 (at 40°C)
Availability / Service: 24/7 Enterprise Operation
Limited Warranty: 5 Years

Power Management

Operating Mode	Power Consumption
Operating (Random Read / Write)	9.3 W
Idle	5.5 W
Efficiency Metric (Idle W/TB)	0.28 W/TB
Input Voltage Requirements	+5VDC (±5%), +12VDC (+10% / -8%)

Physical & Environmental Specifications

Dimensions (H × W × L): 26.1 mm × 101.6 mm × 147.0 mm (1.028 in × 4.000 in × 5.787 in)
Weight (Max): 690 g (1.52 lbs)
Operating Temperature: 5°C to 60°C
Non-Operating Temperature: -40°C to 70°C
Operating Shock (2ms): 40G
Non-Operating Shock (2ms): 200G
Acoustics (Idle / Search): 2.0 / 3.2 Bels (typical)