Western Digital Ultrastar (HGST) HC550 18TB Enterprise Hard Drive WUH721818ALE6L4




Data center decisions are driven by TCO. The Ultrastar DC HC550, with 16TB & 18TB1, play a leading role in reducing TCO.

High Capacity for Massive Data and Lower Total Cost of Ownership

Extreme Capacity

18TB CMR HDD for hyperscale, cloud, and enterprise storage

Areal Density

9-disk platform with 6th generation HelioSeal technology and energy assisted recording drives capacity/density leadership


Cost-optimized configurations for every important capacity point

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 drives. Built using HelioSeal technology, the industry’s only fifth-generation helium platform, the DC HC500 series is designed for public and private cloud environments, where storage density, Watts/TB and $/TB are critical for creating the most cost-efficient infrastructure. HelioSeal technology is key to achieving higher drive capacities, greater reliability ratings and extreme power efficiency. The result is a lower Total Cost of Ownership (TCO) for our cloud and enterprise customers.

Solves TCO Challenges

  • High Capacity – Up to 18TB HDDs, drop-in ready for Big Data workloads
  • Low Power – Up to 58% lower idle W/TB than 8TB Ultrastar air-filled drives
  • More Reliable – 25% higher MTBF rating than air-filled HDDs

Total Cost Of Ownership (TCO) Drives The Data Center Architecture

Data center decisions are driven by TCO. Higher capacity hard drives play a leading role in reducing TCO. An 18TB data center HDD provides 29% more capacity in the same form factor as a 14TB HDD. Higher capacity HDDs enable data centers to lower CapEx by reducing supporting hardware and system level costs when compared to lower capacity drives. Helium-sealed, low power, high reliability drives reduce energy and maintenance costs, contributing to OpEx savings. For example, a data center using 18TB HDDs vs. 14TB HDDs can require 22% fewer racks while consuming 21% less power per TB at idle, resulting in significant overall TCO reduction for data center environments.

Raising The Capacity Bar With New Technologies

Ultrastar DC HC550 integrates a suite of technologies on a 9-disk platform to create a new class of HDDs. 18TB capacity is achieved by combining technologies that improve areal density working together with technologies that improve performance and reduce power consumption.
• The first HDD in the industry to harness Energy-Assisted Magnetic Recording (EAMR) technology improves writability and therefore increases areal density.
• The industry’s first Triple Stage Actuator (TSA) enhances head-positioning accuracy, delivering better performance and increased areal density.
• HelioSeal® technology is the foundation for Western Digital’s high capacity HDDs and this is the 6th generation of HelioSeal product. Western Digital has shipped >65 million HelioSeal products to date.


Specification :

Hard Drive Type Internal hard drive
Form Factor 3.5″
Form Factor (metric) 8.9 cm
Form Factor (Short) 3.5″
Form Factor (Short) (metric) 8.9 cm
Storage Interface Serial ATA-600
Interface Serial ATA-600
Capacity 18 TB
Average Latency 4.16 millisecond
Data Transfer Rate 600 MBps
Internal Data Rate 262 MBps
Spindle Speed 7200 revolutions per minute
Buffer Size 512 megabyte
Non-Recoverable Errors 1 per 10^15
Load / Unload Cycles 6,00,000
24×7 Operation Yes
Features Media Cache Plus, Rotational Vibration Safeguard (RVS), Two-Dimensional Magnetic Recording (TDMR), Conventional magnetic recording (CMR), Triple State Actuator (TSA), Energy-Assisted Magnetic Recording (EAMR), HelioSeal
Interfaces 1 x SATA 6 Gb/s
Compatible Bay 3.5″
Power Consumption 5.6 Watt (idle), 6.5 Watt (typical)
MTBF 2,500,000 Hours
Width 4 inch
Depth 5.8 inch
Height 1 inch
Weight 24.34 ounce
Type 5-year warranty
Shock Acceleration (Operating) 50 gram
Shock Duration (Operating) 2 ms half-sine wave
Shock Acceleration (Non-operating) 250 gram
Shock Duration (Non-operating) 2 ms half-sine wave
Vibration Acceleration (Operating) 0.67 gram
Vibration Frequency Range (Operating) 5-500 Hz
Vibration Acceleration (Non-operating) 1.04 gram
Vibration Frequency Range (Non-operating) 2-200 Hz
Min Operating Temperature 41 degree Fahrenheit
Max Operating Temperature 140 degree Fahrenheit
Min Storage Temperature -40 degree Fahrenheit
Max Storage Temperature 158 degree Fahrenheit

If used by mining, warranty will be given on the basis of TBW*


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