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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 andthis is the 6th generation of HelioSeal product. Western Digital has shipped >65 millionHelioSeal products to date.

Trusted Reliability and Quality for Data at Scale

With its massive capacity and 2.5M MTBF (projected) reliability rating, the Ultrastar DC HC550 is ideal for object storage implementations. Object storage systems with erasure coding provide better data durability compared to RAID systems, given their tolerance for simultaneous error conditions. The DC HC550 offers security and encryption options to help protect data from unauthorized use, including SED models in both SATA & SAS. A SED-FIPS will be available in a SAS configuration. Trust Western Digital and the Ultrastar DC HC550 hard drive to deliver highest capacity, lower TCO and more value to your data center.


  • 18/16TB capacity¹ in a standard 3.5-inch form facto
  • CMR technology works with all capacity enterpriseapplications & environments• Reliable, field-proven, 6th generation design
  • Industry’s first HDD with Energy-Assisted MagneticRecording technology
  • Industry’s first Triple Stage Actuator
  • HelioSeal® design delivers outstanding powerefficiency
  • 2.5M hours (projected) MTBF² rating & 5-year limitedwarranty
  • Self-Encrypting Drive Options


  • Cloud & Hyperscale storage
  • Massive scale-out (MSO), high-density data centers
  • Distributed File Systems
  • Bulk storage using object storage solutions likeCeph™ and OpenStack® Swift
  • Primary and secondary storage for ApacheHadoop® for Big Data Analytics

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