Generations of Proven Designs Provide Reliable, Secure Data Center Scalability

In the zettabyte age, data centers and enterprises must manage the growing abundance and availability of data.  Western Digital delivers a portfolio of dual-port 12 Gb/s Serial Attached SCSI (SAS) SSDs with capacity, performance, and endurance options to help address the challenges of data access. Ultrastar® DC SS540, Western Digital’s 6th generation of SAS SSD drive, delivers exceptional performance to data centers with 96-Layer 3D NAND technology and a proven track record of reliability. Our Ultrastar SAS series includes multiple endurance options to meet the requirements of a full range of applications and workloads. Data security features include self-encrypting drives based on TCG enterprise standards and FIPS validation. Ultrastar SAS SSDs leverage decades of proven enterprise storage expertise in SAS design, reliability, firmware, customer qualification, and system integration to provide end-to-end data protection storage for data centers. Trusted by major OEMs, Ultrastar builds on its strong tradition of leading-edge SAS SSD drives to deliver bigger capacity and higher performance, combined with a continued emphasis on reliability to create global scalable, high-availability servers, and storage systems where data can thrive.


Scale with Confidence

Trusted Interface

Dual port 12 Gb/s SAS helps ensure reliable, fast access to data

Proven Reliability

Trusted in data centers worldwide, with unbeaten 2.5M hr MTBF

Security Options

Protect data with FIPS⁠-⁠validated, self-encrypting TCG models


  • Capacities from 400GB to 15.36TB
  • Reliable, proven dual port 12 Gb/s SAS interface supports high-availability storage environments
  • 3D TLC NAND Flash delivers performance and endurance
  • Multiple endurance options support range of data center workloads
  • Enterprise-class 2.5M hour MTBF reliability rating

Applications and Workload

  • Enterprise-class servers and high performance computing
  • Online Transaction Processing (OLTP)
  • Financial Transaction Systems
  • File Servers
  • Database Analytics.
  • Space and/or power-constrained environments

Maximize Server and Storage Scalability with Ultrastar DC SS530 SAS SSD


Enterprise Solutions Made Better by SAS

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. Explore these solutions to learn how our Ultrastar SAS SSDs can help you reduce bottlenecks, improve performance, decrease bandwidth constraints, and provide for deeper insights into existing data.


Ultrastar SAS Series
Product Portfolio

Up Arrow

Ultrastar DC SS540

Ultrastar DC SS530


High Performance

Delivers up to 470K random read and 240K random write IOPS 

Capacity and Endurance

Capacities up to 15.36TB with multiple endurance SKUs to cover mainstream endurance ranges

Proven Reliability

2.5 million MTBF (mean-time-between-failure) with 96-Layer 3D TLC NAND



Ultrastar DC SS540



SAS 12 Gb/s

Form Factor

SFF 2.5-inch drive


3 DW/D: 6.4TB / 3.2TB / 1.6TB / 800GB / 400GB
1 DW/D: 15.36TB / 7.68TB / 3.84TB / 1.92TB / 960GB / 480GB

Endurance (Drives writes per day, DW/D)2


Maximum Terabytes Written (TBW)

3 DW/D: 36,170 / 17,520 / 9,410 / 4,700 / 2,350
1 DW/D: 30,110 / 15,050 / 6,790 / 3,760 / 1,880 / 940

Flash Memory Technology



Sequential Write (max MiB/s, 128KiB)


Random Read (max IOPS, 4KiB)


Random Write (max IOPS, 4KiB)

3 DW/D: 240,000
1 DW/D: 110,000

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

3 DW/D: 300,000
1 DW/D: 200,000

Read/Write Latency (μs, max)4

3 DW/D: 150/80
1 DW/D: 150/300


Unrecoverable Bit Error Rate (UBER)

1 in 1017

MTBF (M hours)5


Annualized Failure Rate (AFR)


Availability (hrs/day x days/week)


Limited Warranty

5 years



+5 VDC, +12 VDC

Operating (W, typical)

9, 11, 14

Idle (W, average)

<15TB: 3.7W, >15TB: 4.7W

Physical Size

z-height (mm)


Dimensions (width x depth, mm)

70.1 x 100.45

Weight (g, max)



Operating Temperature7

0°C to 70°C

Non-operating Temperature

-40°C to 85°C

People Also Viewed



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.


Endurance 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.


Average Write Latency at 4KiB QD=1.


MTBF and AFR targets are based on a sample population and are estimated by statistical measurement and acceleration algorithms under median operating conditions. MTBF and AFR rating 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. 


Internal drive temperature as measured via the drive's temperature sensor. 

How to Buy Western Digital

Get in touch with distributors and resellers across the world.

Have a question for our storage experts?

Fill out this form and one of our storage experts will reach out to you to help you determine which configuration best meets your needs and give you best pricing for that configuration.

Field cannot be empty.
Field cannot be empty.
Enter a valid email address.
Field cannot be empty.
Field cannot be empty.
Field cannot be empty.
Field cannot be empty.
Field cannot be empty.
Field cannot be empty.

By clicking the "Contact Me" button below, I agree to Western Digital's Privacy Statement and authorize Western Digital and its selected partners to use my personal data in order to get updated information on Western Digital products, services, promotions, news, surveys and events from the marketing and sales organizations. I understand I can withdraw my consent at any time.

This form is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.