WD Ultrastar DC H550C 18TB 3.5" SATA Enterprise HDD/Hard Drive 7200rpm

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Driving Up Capacity and Driving Down TCO for Cloud and Hyperscale Data Centers

The breadth and depth of Big Data is driving the universal need for higher capacities across a broad spectrum of applications and workloads. Laying the foundation for a worry-free data center, Western Digital delivers the capacity to conquer the data explosion with the Ultrastar DC HC500 series of hard disk drives (HDDs). The DC HC500 series is designed for public and private cloud environments where storage density and cost-efficient infrastructure is critical.

The 18TB Ultrastar DC HC550 HDDs are the first commercial implementation of Energy-Assisted Magnetic Recording technology and utilize the industry’s first Triple Stage Actuator. These technologies, integrated with HelioSeal on a 9-disk platform, deliver the highest areal density and unmatched Total Cost of Ownership for customer and market needs.


• Industry’s first Energy-Assisted Magnetic Recording technology
• Industry’s first Triple Stage Actuator
• Leading HelioSeal technology
• Reliable, field-proven design across five generations
• HelioSeal design delivers power efficiency (Watts/TB)

Applications and Workloads
• Cloud & Hyperscale Storage
• Massive Scale-Out (MSO), high-density data centers
• Distributed File Systems
• Bulk storage using Object storage solutions like Ceph™ and OpenStack Swift
• Primary and secondary storage for Apache Hadoop® for Big Data Analytics
• Surveillance Analytics


Capacity 18 GB
Edition UltraStar
Form Factor 3.5"
Flash Memory Size N/A
Flash Memory Type N/A
Height 26.1 mm
Rotation Speed 7200 rpm
Sector Size 512E/4096N
Cache 512MB
Access Time 4.16 ms
Host to/from Drive Sustained Transfer Rate  
Interface SATA 3.0 (6Gb/s)
Load/Unload Cycles 600000
Annualised Workload Rating 550 TB/yr
Non-Recoverable Read Errors per Bits Read <1 in 10^15
Max. Operating Shock 50 G
Max.Power Usage 6.5 W
Dimensions 101.6 x 26.1 x 147 (WxHxD mm)
Package Type OEM