Ultrastar SAS Series

Ultrastar SAS Series

Scalability for Servers and Storage with Proven, Trusted Design


Generations of Proven Designs Provide Reliable, Secure Data Center Scalability

As data centers and enterprises struggle to 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 SS530, our newest SAS SSD, delivers up to 15.36TB, double the capacity of prior generations. Our Ultrastar SAS series includes three 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 drives are trusted by major OEMs and leverage decades of proven enterprise storage expertise in firmware development, design, and reliability. Ultrastar builds on its strong tradition of leading-edge SAS SSD products to deliver more capacity and better 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 MLC or TLC NAND Flash delivers performance and endurance
  • Three 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

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.

Suitable for:

  • Application Workloads
  • Big Data
  • Government
  • Financial Services
 Ultrastar DC SS530
InterfaceSAS 12 Gb/s
Form FactorSFF 2.5-inch drive
Capacity 110 DW/D: 3.2TB / 1.6TB / 800GB / 400GB
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) 210
Maximum Terabytes Written (TBW)10 DW/D: 59,690 / 29,410 / 15,220 / 7,630
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 Technology3D TLC NAND

Sequential Write (max MiB/s, 128KiB)2120
Random Read (max IOPS, 4KiB)440,000

Random Write (max IOPS, 4KiB)10 DW/D: 320,000
3 DW/D: 240,000
1 DW/D: 100,000
Mixed Random Read/Write (max IOPS 70%R/30%W, 4KiB)10 DW/D: 430,000
3 DW/D: 330,000
1 DW/D: 190,000
Read/Write Latency (μs, max) 410 DW/D: 92/26
3 DW/D: 92/27
1 DW/D: 92/36
Unrecoverable Bit Error Rate (UBER)1 in 10^17
MTBF (M hours) 52.5

Annualized Failure Rate (AFR)0.35%

Availability (hrs/day x days/week)24x7
Limited warranty 65 years
Requirement+5 VDC, +12 VDC
Operating (W, typical)9, 11, 14
Idle (W, average)3.2
Physical Size
z-height (mm)15
Dimensions (width x depth, mm)70.1 x 100.45
Weight (g, max)175
Operating Temperature 70°C to 70°C
Non-operating Temperature-40°C to 85°C
 MLC NAND TechnologyTLC NAND Technology
InterfaceSAS 6/12Gb/s Supports Wide Port @ 12Gb/sSAS 6/12Gb/s Supports Wide Port @ 12Gb/s
Capacity (GB)10DW/D: 3.2TB / 1.6TB / 800GB / 400GB
3DW/D: 3.2TB / 1.6TB / 800GB / 400GB
7.68TB / 3.84TB / 1.92TB / 960GB / 480GB
Form Factor2.5-inch SFF
2.5-inch SFF
Flash Memory Technology3D Multi-Level Cell (MLC) NAND3D Tri-Level Cell (TLC) NAND
Sequential Read (max MB/s, 128KiB)2100 | 21002100
Sequential Write (max MB/s, 128KiB)2050 | 20501250
Random Read (max IOPS, 4KiB)400K | 400K400K
Random Write (max IOPS, 4KiB)200K | 170K85K
Mixed Random Read/Write (max IOPS 70%R/30%W, 4KiB)285K | 265K170K
Latency85 μs | 85 μs105 μs
Error Rate (non-recoverable, bits read)1 in 10^171 in 10^17
MTBF (M hours)2.5
Annual Failure Rate (AFR)0.35%0.35%
Availability (hrs/day x days/wk)24x724x7
Limited Warranty (yrs)5 years or Max PB written, whichever occurs first5 years or Max PB written, whichever occurs first
Endurance (max TB written)10DW/D: 53100 / 26500 / 13200 / 7300
3DW/D: 15900 / 7900 / 3900 / 1980
13100 / 6600 / 3150 / 960
Endurance10DW/D | 3DW/D~1DW/D
Requirement+5 VDC, +12VDC+5 VDC, +12VDC
Operating (W, typical)9, 11, 149, 11, 14
Idle (W)<3.2TB: 3.7, ≥ 3.2TB: 4.7 (max)<3.2TB: 3.7, ≥ 3.2TB: 4.7 (max)
Physical Size
Z-Height (mm)1515
Dimensions (width x depth, mm)70.1 x 100.670.1 x 100.6
Weight (g, max)140
Environmental (operating)
Ambient Temperature0º to 60º C0º to 60º C
Shock (half-sine wave)500G (2ms)500G (2ms)
Vibration (5 to 700 Hz)2.16 G RMS, random (XYZ)2.16 G RMS, random (XYZ)
Environmental (non-operating)
Ambient Temperature-40º to 80º C-40º to 80º C
Shock (half-sine wave)1000G (0.5ms)1000G (0.5ms)
InterfaceSAS 12Gb/sSAS 12Gb/s
Capacity (GB)3.2TB, 1.6TB, 800GB, 400GB7.68TB, 3.84TB, 1.92TB, 960GB, 480GB
Form Factor2.5-inch2.5-inch
Sequential Read (max MB/s, 128KiB)18001800
Sequential Write (max MB/s, 128KiB)10001000
Random Read (max IOPS, 4KiB)250,000
Random Write (max IOPS, 4KiB)86,00037,000
Mixed Random Read/Write (max IOPS 70%R/30%W, 4KiB)154,00090,000
Error Rate (non-recoverable, bits read)<1 in 10^17<1 in 10^17
MTBF (M hours)2.5M hours

2.5M hours
Annual Failure Rate (AFR)0.35%0.35%
Limited Warranty (yrs)55
Endurance 3 (Drive writes per day)1 (Drive writes per day)
Data Durability3-month at 40°C
3-month at 40°C
Requirement5V & 12V (DC +/- 5%)5V & 12V (DC +/- 5%)
Operating (W, typical)9 or 11 (configurable)9 or 11 (configurable)
Idle (W)3.8 to 4.33.8 to 4.3
Physical Size
Z-Height (mm)1515
Dimensions (width x depth, mm)69.85 x 100.4569.85 x 100.45
Weight, Without Brackets(g)200
Environmental (operating)
Case Temperature0°C to 70°C0°C to 70°C