PRODUCT BRIEF
TLC 2.5-inch SSF, SAS 12Gb/s
800GB-15.36TB,
Maximize Storage and Server Scalability with SAS SSDs
Data is transforming the world and growing at an exponential pace. The SAS interface
continues its dominance in traditional enterprise storage arrays, making the ever-increasing
volume of data rapidly and reliably available. Storage solutions depend on SAS’s protection
features, such as dual-port failover for redundancy, and SAS’s high reliability to power missioncritical applications such as ERP, OLTP, OLAP, and more.
Ultrastar® DC SS540, Western Digital’s 6th generation of SAS SSD drive, delivers performance
to data centers with 96-layer 3D NAND technology and a proven track record of reliability.
Designed with a dual-port 12Gb/s SAS interface for seamless integration into data center
environments, the Ultrastar DC SS540 SAS SSD is available in capacities from 800GB to 15.36TB.
Achieving exceptional performance by delivering up to 470K/240K Random Read/Random
Write IOPS, the DC SS540 of fers the best value for data centers by providing dual/single port
support, desired features, power options, multiple endurance SKUs and mainstream capacities.
It is ideal for ultra high-performance tier-0 enterprise storage, high performance computing
(HPC), and software-defined storage (SDS).
Highlights
• 3rd generation 96-layer 3D TLC NAND flash for
performance and endurance
• 12Gb/s SAS interface for maximum
throughput
• Advanced power-loss and data-management
technology
• Self-encrypting models conform to TCG’s
Enterprise specifications
Applications
• Ultra-high performance tier-0 enterprise
storage
• Enterprise-class servers and high
performance computing (HPC)
• Software-defined storage (SDS)
• Online transaction processing (OLTP)
• Finance and e-commerce
• Database analytics
Proven Architecture with Industry-Leading Quality and
Reliability
Ultrastar DC SS540, with 96-layer 3D TLC NAND flash, leverages the proven architecture of
the prior generations of SAS to achieve an extraordinary 0.35% annual failure rate (AFR) or 2.5
million hours mean-time-between-failure (MTBF). DC SS540 of fers two endurance options of 1
and 3 drive writes per day (DW/D) to meet the most stringent data center requirements.
Help keep confidential data secure by deploying self-encrypting drive technology that
supports Trusted Computing Group (TCG) Enterprise standards for security services and FIPS
140–2 validation for cryptographic-enabled drives that are required for certain government
applications. The Ultrastar DC SS540 is backed by a five-year limited warranty or the maximum
petabytes (PB) written (based on capacity), whichever comes first.
Trust Your Storage Systems with SSD Products
Developed by Experts in Enterprise Storage
Ultrastar SAS SSDs leverage decades of proven enterprise storage expertise in Serial Attached
SCSI (SAS) design, reliability, firmware, customer qualification, and system integration to
provide end-to-end data protection storage for data centers. The synergistic relationship
between throughput-enhancing SSDs and traditional HDDs provides cost-effective option that
delivers reliability, compatibility, capacity, cost savings, and system performance. Ultrastar SAS
SSD drives are the ideal choice to help meet escalating reliability, endurance, and performance
requirements in the most demanding data center environments.
Features and Benefits
Feature / Function Benefits
Performance • SAS 12Gb/s interf ace
Power • 9, 11 and 14 Watt options • Higher IOPS performance with higher power options
Capacity • 800GB to 15.36TB • High capacit y in standard form factor with lower Watt s/TB
Reliability • 0.35% AFR (2.5M hours MTBF)
Security Features • Instant Secure Erase models (Crypto Sanitize)
• 3D TLC NAND flash memory
• Up to 2130 / 2109 MiB/s sequential R/W
• Up to 470K / 240K IOPS random R/W
• 1E-17 bit error rate
• Power loss data management
• Unlimited reads, up to 59PB writes
• T10 end-to-end data protection
• TCG + FIPS (forthcoming) encryption models
• 12G Active -Active Dual por t and 12G single/dual port for enhanced reliability
• High read/write performance
• Maximum throughput and IOPS for ultra-fast access to data
• Reduced field replacement effort
• Enhanced error detection and correction for optimal data integrity
• Assures data integrity during power failure
• Support for extreme write-intensive applications
• Protection against flash die failures
• Enables swift drive redeployment and retirement
• Hardware-based en cryption helps protect dat a from unauthorized use
PRODUCT BRIEF
Ultrastar® DC SS540 Specifications
Configuration
Model Number
Capacity 6. 4TB 3.2TB 1.6TB 800GB 15.36TB 7.6 8TB 3.84TB 1.92TB 960GB
Endurance
(Drive Writes per Day– DW/D)
Max Terabytes Written (TBW) 36,150 1 7, 5 10 9, 41 0 4,700 30,110 15,050 7,000 3,760 1,880
Interface SAS 6/12Gb/s support s Wide port @ 12Gb/s
Form Factor 2.5-inch 15mm SFF
Flash Memory Technology 3D TLC NAND
Performance
Read Throughput
(max MiB/s, Sequential 128KiB)
Write Throughput
(max MiB/s, Sequential 128KiB)
Read IOPS (max, Random 4KiB) 470,000 470,000 389,000 237,000 441,000 470,000 470,000 370,000 237,000
Write IOPS (max, Random 4KiB) 240,000 228,000 184,000 128,000 110,000 110,000 99,466 79,055 88,133
Mixed IOPS (70/30 R/W, max, 4KiB) 300,000 29 7, 3 11 260,103 182,685 188 ,906 200,000 185,662 151,386 142,959
Read/Write L atency (s, avg) 15 0/80 150/ 70 140/70 14 0/6 0 15 0/3 00 150/20 0 140/2 00 1 40/11 0 140/9 0
Reliability
Unrecoverable Bit Error Rate
(UBER)
MTBF (M hours) 2.5
Annualized Failure Rate (AFR) 0.35%
Availability (hrs/day x days/wk) 24×7
Limited Warranty 5 years
Power
Requirement (+/- 5%) +5 VDC, +12VDC
Operating Modes (W, typical) 9, 11, 14
Idle (W, max) (Projec ted) <15TB: 3. 7W, >15TB: 4.7W
Physical Size
z-height (mm) 15
Dimensions (width x depth, mm) 70.1 x 100.45
Weight (g, ma x) 175
Environmental
Operating Temperature 0°C to 70° C
Non-operating Temperature -40°C to 80°C
¹ One meg abyte (MB) is equal to one mi llion by tes, one gigabyte (GB) is e qual to 1,0 00MB (on e billion bytes), and one ter abyte ( TB) is equ al to 1,000GB (one tr illio n bytes) wh en refe rring to storage
capacity. Accessible c apaci ty may be less due to operating environm ent.
² Endurance rat ing bas ed on DW/D using 8KiB rando m write workloa d over 5 year s.
³ Based on intern al test ing. Performance will var y by capa city point, or w ith the change s in useable cap acit y. Consult p roduc t manual for fu rthe r details. All p erforman ce measurements are in full
susta ined mode and are peak values. Subject to chan ge.
⁴ Average R/W latency at 4KiB Q D=1.
⁵ MTBF and AFR spec ific ations are base d on a sample pop ulation and are estim ated by st atistical measure ment s and acceleration algorithms under typical op erating conditions f or this drive mod el.
MTBF and AFR ratings do not predic t an ind ividual drive’s reliab ility and do not consti tute a war rant y.
⁶ The warranty f or the product will exp ire on the earlier of (i) the date wh en the f lash me dia has reache d one-percent (1%) of its remaining life or (ii) the expiration of the time p eriod a ssoci ated wit h
the product.
⁷ Intern al drive temper ature as m easured via the drive’s temperature sensor.
3 DW/ D 3 DW/ D 3 DW/ D 3 DW/ D 1 DW/D 1DW/ D 1D W/ D 1D W/ D 1D W/ D
WUSTR6464ABSS20x WUSTR6432BSS20x WUSTR6416BSS20x WUSTR6480BSS20x WUSTVA1A1BSS20x WUSTVA176BSS20x WUSTVA138BSS20x WUSTVA119BSS20x WUSTVA196BSS20x
3 3 3 3 1 1 1 1 1
2,130 2,13 0 2,116 2,130 2 ,130 2,130 2,119 1,992 1,985
2,109 2,102 1,780 1,008 1,104 2,101 2,045 1,677 1,024
1 in 10
How to Read Model Number
Examp le: WUSTR6464ASS201=6.4TB, SAS 12Gb/s, TCG
W = Western Digita l
U = Ultrastar
S = Standard
TR = NAND ty pe/enduran ce
(TM=TLC/mainstream endurance,
TR=TLC/read-intensive)
64 = Full capacity (6.4TB)
64 = Capacity of this mo del
15 = 15.2TB
76 = 7.6TB
38 = 3.84TB
32 = 3.2TB
19 = 1.92TB
16 = 1.6TB
96 = 960GB
80 = 800GB
48 = 480GB
40 = 400GB
A = Generation code
S = Small fo rm fac tor (2.5” SFF)
S2 = Inter face, SAS 12Gb/s
1 = Encryption s etting
0 = Insta nt Secure Erase
1 = TCG Enterpr ise enc rypt ion
4 = No encr yption/Secure Erase
5 = TCG+FIPS
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© 2019 Western D igital C orpor ation or it s affiliates. Al l rights r eserve d. Western Digita l, the Wester n Digital logo an d Ultras tar are register ed trademarks o r tradem arks of Western Digi tal
Corpor ation or i ts affil iates in the US and/or other co untries. All othe r marks are the prop erty of their res pective owners. R eferen ces in this public ation to Weste rn Digital prod ucts, p rogram s,
or serv ices do not i mply that they will b e made avillable in a ll countries. Pro duct specifica tions prov ided are sample s pecific ations th at are subject to ch ange and d o not constitute a war ranty.
Visit our website, www.westerndigital.com/support, for additional information on product specifications. Pictures shown may vary from actual products.
02–05-WW-04–00171 v1.0 November 2019
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