Ultrastar DC HC600 SMR Series

Purpose-Built Efficiency for Sequential Write Workloads


Scaling Cloud and Hyperscale Capacity to New Levels with SMR Technology

As cloud and hyperscale data centers continue to look for affordable options to capture the growing volume and variety of data, Western Digital’s Ultrastar DC HC600 series of drives help address Big Data challenges with sequential write workloads. Optimized to deliver ununbeaten capacity and low Total Cost of Ownership (TCO), the Ultrastar DC HC600 series provides unprecedented capacity leadership by harnessing two core complementary technologies: HelioSeal technology and host-managed SMR (HM-SMR).

These field-proven technologies provide the foundation for delivering efficiency, quality, and reliable performance required by cloud and hyperscale data centers. Unlike CMR drives, HM-SMR drives are not drop-in replacements for traditional drives and require system software modifications that take advantage of the new command sets to ensure data is written sequentially to the drive. This software investment helps yield the most cost-efficient storage solutions.


Better TCO for Sequential-Write Applications

Massive Capacity

Up to 20TB capacity to capture, preserve, and access huge volumes of data


Host-managed SMR design supports sequential-write workloads

Extreme Efficiency

Our lowest power data center drive (Watts/TB)


  • Combines HelioSeal and host-managed SMR to deliver more cost-effective capacity than conventional magnetic recording (CMR) drives.
  • Purpose-built for “sequential write” applications and workloads
  • Consistent, predictable performance with uncompromising enterprise-class quality and reliability.
  • 2.5M hour MTBF rating.
  • 5-year limited warranty

Applications and Workload

  • Big Data or Bulk Storage
  • Cloud Storage
  • Social Media
  • Content Libraries, Streaming Media and Digital Media Assets
  • Online Back-up and Replication
  • Compliance, Audits, and Regulatory Records

Ultrastar DC HC600 Series
Product Portfolio

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Colossal Capacity

20TB Host-managed SMR HDD to power the Zettabyte Age

Areal Density

9-disk platform with 6th generation HelioSeal technology delivers innovative density leadership


Optimized to increase capacity and density by storing sequential blocks of data in zones for cost-effective storage






SATA 6 Gb/s



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One megabyte (MB) is equal to one million bytes, one gigabyte (GB) is equal to 1,000MB (one billion bytes), and one terabyte (TB) is equal to 1,000GB (one trillion bytes) when referring to storage capacity. Accessible capacity will vary from the stated capacity due to formatting, system software, and other factors.


Advanced Format drive: 4K (4096-byte) physical sectors.


Portion of buffer capacity used for drive firmware.


1MiB = 1,048,576 bytes (220), 1MB = 1,000,000 bytes (106).


MTBF and AFR targets are based on a sample population and are estimated by statistical measurements and acceleration algorithms under median operating conditions. MTBF and AFR ratings do not predict an individual drive’s reliability and do not constitute a warranty.


SATA models: 8K Queue Depth = 1 @ 40 IOPS, SAS models: 4K Queue Depth = 4 @ Max IOPS.


Idle specification is based on use of Idle_A.

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