WD Ultrastar 8TB 256MB SAS HDD – HUS728T8TAL5204

SKU: 0B36400

Out of stock


Out of stock

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Economics and Access Speed: Key Requirements for Low Capacity HDDs in the Data Center

As the industry evolves to develop purpose-built solutions for growing data storage requirements, IT managers continue to rely on lower capacity drives that are economical to acquire, yet deliver quick and reliable data access for traditional data center applications. Designed to handle workloads up to 550TB per year, Ultrastar® DC HC320* is an 8TB1 HDD that helps address economic and access requirements of many traditional IT workloads. Low capacity drives also help address architecture limitations.

Part of our mid-capacity DC HC300 series, the Ultrastar DC HC320 is designed for traditional storage and server applications as well as distributed and scalable

computing, including block and file storage architectures, providing fast 7,200 RPM performance and lower acquisition cost to help ease budget constraints. Ultrastar DC HC320 is offered with either 6Gb/s SATA or 12Gb/s SAS interface in a 512e9 format.


  • Excellent random and sequential performance
  • 8TB capacity point supports traditional IT systems
  • Sustained transfer rate up to 255MB/s
  • Choice of 12Gb/s SAS or 6Gb/s SATA
  • Advanced Format 512e9 models
  • Self-Encrypting Drive options
  • 3-year limited warranty

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Technology Innovation Delivers Efficiency and Performance for Traditional IT Systems

Ultrastar DC HC320 is based on a proven 5-disk air platform design that uses conventional magnetic recording (CMR) technology in a 3.5-inch large form factor. Compared to the prior generation, Ultrastar 7K6000, the DC HC320 delivers 33% more capacity, up to 12% performance boost and uses slightly larger-diameter media. It features a second-generation, dual-stage micro actuator to enhance head positioning accuracy for better drive performance. Write performance gains are also supported by Western Digital’s media cache architecture, a disk-based caching technology

that provides a large cache area on the disk, which also improves reliability and data integrity during unexpected power loss. Finally, the addition of flash-based non- volatile cache (NVC) on both SATA and SAS models helps improve write performance.

The Ultrastar DC HC320 also includes a Rebuild Assist feature, which helps dramatically reduce RAID rebuild times and maintain system performance during the rebuild process. Learn more in our Rebuild Assist technical brief.

Applications & Workloads

  • Distributed file systems, like Apache Hadoop®, to support Big Data analytics
  • Direct & Network Attached Storage (DAS & NAS)
  • RAID arrays

Data Security with Trusted Quality, Reliability

Compliance and privacy requirements drive the need for increased data security. Ultrastar DC HC320 helps protect data from unauthorized use by offering security and encryption options. Both SAS and SATA models offer hardware-based encryption options, which includes both Sanitize Crypto Scramble / Erase functionality and TCG encryption (Trusted Computing Group, Enterprise SSC). Additionally, SAS SED is also

offered as a FIPS 140–2 Level 2 certified model. The Ultrastar DC HC320 extends Western Digital’s long-standing tradition of reliability leadership with a 2M-hour MTBF2 rating and a 5-year limited warranty.

Features & Benefits

Feature / Function


Capacity •  8TB

•  Advanced Format

•  Lower capacity point for traditional IT workloads and applications

•  Enables higher capacity and reliability

Performance •  Non-volatile cache (NVC)

•  Up to 255MB/s transfer rate

•  Improved write performance and write splice protection

•  Up to 12% faster than Ultrastar 7K6000

Reliability •  Dual-stage Micro Actuator

•  2M hours MTBF and 0.44% AFR

•  3-year limited warranty

•  Better head positioning and rotational vibration robustness

•  One of the highest reliability ratings for air-filled Capacity Enterprise HDDs




Model No. HUS728T8TAL5204


Interface SAS 12Gb/s
Form Factor


Format: Sector size3
4Kn: 4096, 4104,

4160, 4224

512e: 512, 520, 528

Max. Areal density (Gbits/sq. in.) 834


Data buffer4
Rotational speed (RPM) 7200
Latency average (ms) 4.16
Interface transfer rate (MB/s, max) 1200
Sustained transfer rate5

(MiB/s, typical)
(MB/s, typical)

Upto 243
Upto 255


Error rate (non-recoverable, bits read) 1 in 1015
Load/Unload cycles (at 40ºC) 600,000
Availability (hrs/day x days/wk) 24×7
(M hours)
Annualized Failure Rate2
Warranty (yrs) 3


Idle (Bels, typical) 2.9 / 3.6


Requirement +5V, +12V
Operating7 12.8
Idle8 (W)  8.4
Power consumption efficiency at Idle (W/TB)

Physical size

z-height (mm) 26.1
Dimensions (width x depth, mm) 101.6 (+/-0.25) x 147
Weight (g, max)  715

Environmental (Operating)

Ambient temperature
to 60º
Shock half-sine wave 2 ms, G) 70
Vibration (G RMS 5 to 500 Hz) 0.67 (XYZ)

Environmental (Non-Operating)

Ambient temperature -40º
to 70º
Shock (half-sine wave, G) 300 (2ms) / 150 (11ms)
Random vibration
(G RMS 2 to 200 Hz)
1.04 (XYZ)

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