Ultrastar NVMe™ Series

Low Latency and Maximum Throughput for High-Transaction Workloads


Accelerate Access to Critical Data for Data-Intensive Workloads and Applications

Ultrastar NVMe series SSDs perform at the speed of today’s business needs. Enabling faster intelligence & access to critical data, these SSDs meet the growing digital demands of your business applications.

Performance NVMe Ultrastar DC SN840 SSDs deliver extreme performance & ultra-low latency to the top tier of enterprise storage. With proven dual-port NVMe architecture, these drives are best suited for performance demanding platforms including HPC servers, mission-critical applications and workloads that require superior read/write performance and low latency.

Mainstream NVMe Ultrastar DC SN640 SSDs are optimized for consistent quality of service and low latency for mixed random read/write workloads commonly generated by top enterprise applications such as virtualization, OLTP, NoSQL, web servers, file servers and mail servers. Ultrastar DC SN640 enables a seamless transition from SATA SSDs, delivering high performance for deeper insights & faster results for today’s data intensive applications.


Accelerate Access to Critical Data

Maximum Throughput

Performance NVMe SSDs designed to accelerate data center workloads

Low Latency

Predictable throughput for high-transaction workloads

Design Flexibility

Choice of form factors to support range of data centers requirements


  • Performance and Mainstream NVMe SSDs
  • Capacities up to 15.36TB1 in U.2 2.5" form factor
  • High-performance PCIe Gen 3 
  • 96-Layer 3D NAND for Ultrastar DC SN840, DC SN640 and DC SN340
  • Up to 780k random read IOPS3
  • Dual-port high availability for Ultrastar DC SN840, DC SN200
  • Ideal for common enterprise mixed-use workloads
  • Enterprise-class reliability rating, 2.5M hour MTBF5

Applications and Workload

  • Cloud and Hyperscale computing
  • Online transaction processing (OLTP)
  • Online analytical processing (OLAP)
  • Virtualization
  • Storage Arrays
  • Storage Servers
  • SQL Servers
  • Pattern Recognition
  • Artificial Intelligence
  • Machine Learning

Better with NVMe


Enterprise Solutions Made Better by NVMe

Everywhere data lives, from sensors to mobile devices to the cloud, we’re driving the innovation necessary to stay ahead of new demands. Our breadth of expertise and level of integration gives us an unmatched ability to deliver carefully calibrated solutions for every type and use of data.


Ultrastar NVMe Series
Product Portfolio

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Ultrastar DC SN840

Ultrastar DC SN640

Ultrastar DC SN200

Ultrastar DC SN630

Ultrastar DC SN340


Application Performance

Up to 503K Mixed RR/RW IOPS (70% Read, 30% Write, 4KiB)

Dual-port Leadership

2nd generation Western Digital designed dual-port high availability NVMe architecture

Endurance and Security

1 DW/D & 3 DW/D endurance options with TCG encryption and FIPS 140-2 validation (forthcoming)




PCIe 3.1 (1x4 or 2x2) NVMe™ 1.3c, Western Digital dual-port high availability

Form Factor

U.2, 15mm, 2.5” drive


3 DW/D: 6.4TB / 3.2TB / 1.6TB

1 DW/D: 15.36TB / 7.68TB / 3.84TB / 1.92TB

Maximum Terabytes Written (TBW)2

3 DW/D: 35,040 / 17,520 / 8,760

1 DW/D: 28,032 / 14,016 / 7,008 / 3,504


Sequential Read (max (MB/s, 64KiB))3


Sequential Write (max (MB/s, 64KiB))


Random Read (max IOPS, 4KiB)


Random Write (max IOPS, 4KiB)


Mixed Random Read/Write (max IOPS 70%R/30%W, 4KiB)


Average Read Latency (μs, min) 4



Unrecoverable Bit Error Rate (UBER)

<1 in 1017

MTBF (M hours, projected)5


Annualized Failure Rate (AFR, projected)


Limited Warranty (yrs)6


Data Retention

40°C/90-day equivalent


Requirement (DC, +/- 5%)

3.3V (aux) & 12V

Operating (W, max average)


Idle (W)


Physical Size

z-height (mm)


Dimensions (width x depth, mm)

69.85 x 100.45


Operating Temperature

0° to 70°C (Case)

Airflow (LFM)

-40° to 85°C

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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.



Edurance rating based on DW/D using 4KiB random write workload over 5 years.



Performance will vary by capacity point, or with the changes in useable capacity. Consult product manual for further details. All performance measurements are in full sustained mode and are peak values. Preliminary and subject to change. 1MiB=1,048,576 bytes or 220, 1KiB= 1,024 bytes or 210.



Measured as 100% Random Read, 4KiB, QD=1, 99.99%.


MTBF and AFR specifications will be based on a sample population and are estimated by statistical measurements and acceleration algorithms under typical operating conditions for this drive model. MTBF and AFR ratings do not predict an individual drive’s reliability and do not constitute a warranty.



The warranty for the product will expire on the earlier of (i) the date when the flash media has reached one-percent (1%) of its remaining life or (ii) the expiration of the time period associated with the Product. 


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