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WD Ultrastar 16TB HDD DC HC550 7200RPM SATA 6Gb/s 3.5" Enterprise Hard Drive WUH721816ALE6L4 (0F38462)

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Form Factor3.5"
Spindle Speed7.2K RPM
Warranty3 Years Manufacturer

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Western Digital Ultrastar DC HC550 16 TB SATA Hard Drives

Ultrastar DC HC550 (0F38462)

  • The first HDD in the industry to harness Energy-Assisted Magnetic Recording (EAMR) technology improves writability
  • The industry’s first Triple Stage Actuator (TSA) enhances head-positioning accuracy
  • HelioSeal technology is the foundation for Western Digital’s high capacity hard drives
  • 21% lower idle W/TB than 14TB Ultrastar helium-filled drives
  • 512MB cache buffer improves response time and data management

16TB Provides 14% more capacity than 14TB helium-filled drives

Ultra-low Watts per Terabyte (W/TB) 21% lower idle W/TB than 14TB Ultrastar helium-filled drives

Triple Stage Actuator and Two-Dimensional Magnetic Recording (TDMR) technology More accurate head positioning, especially in multi-drive environments, for better performance and data integrity

Rotational Vibration Safeguard (RVS) Maintains drive performance in high rotational vibration environments and multi-drive systems

Media Cache Plus architecture Better random write performance

512MB cache buffer Improves response time and data management

Dual Safe, RSA-signed firmware Retains previous firmware version for safe firmware updates, verified with an RSA signature

2.5M hours MTBF and 0.35% AFR Unsurpassed reliability rating for Capacity Enterprise HDD for fewer failures/less service needs



  • 16TB capacity in a standard 3.5-inch form factor
  • CMR technology works with all capacity enterprise applications & environments
  • Reliable, field-proven, 6th generation design
  • Industry’s first HDD with Energy-Assisted Magnetic Recording technology improves writability and therefore increases areal density
  • Industry’s first Triple Stage Actuator enhances head-positioning accuracy, delivering better performance and increased areal density
  • HelioSeal design delivers outstanding power efficiency
  • 2.5M hours (projected) MTBF rating
  • 512e SATA 6Gb/s
  • Legacy Pin 3 config – no power disable support
  • Base (SE), no encryption. Sanitize overwrite only


  • 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
Type Enterprise HDD
Brand Western Digital
Series Ultrastar DC HC550
Model Number WUH721816ALE6L4
Part Number 0F38462
Form Factor 3.5"
Capacity 16TB
Interface SATA 6Gb/s
Spindle Speed 7.2K RPM
Tray Tray not included
Weight 1.7 lbs
Width 4 in
Height 1 in
Depth 5.8 in
Condition - New : 3 Years Limited Period Manufacturer Warranty
Satisfaction Guarantee: Return for refund within 30 days of package reception date.
This item is covered by Return Policy
To initiate a return please fill out the Return Form
For frequently asked questions about warranties and returns please visit our FAQs
Our drives ship in 225lb per sq inch pressure-rated boxes, specifically tested for impact. Inside the box you’ll find suspension brackets, foam inserts, or air filled pockets that secure the drive in place and prevent any possible impact from movement in the shipping process. The drive itself is sealed in an anti-static bag that protects the drive from any electromagnetic interference.
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