DATA SH E E T
2.5-inch U.2, 7mm, NVMe SSD
800GB, 1.6TB, 3.2TB, 6.4TB,
960GB, 1.92TB, 3.84TB, 7.68TB¹
Features
• Western Digital NVMe 1.3c compliant controller;
PCIe Gen3.1×4
• Western Digital BiCS4 96L 3D TLC NAND
• 0.8 and 2 DW/D
• Data-loss protection
• MTBF rating of 2 million hours
• Secure Erase (SE), Instant Secure Erase (ISE), TCG
Ruby
• 5-year limited warranty
• Enterprise features including variable sector
sizes, end-to-end data path protection and
Power Loss Protection. TCG Ruby models
include 128 namespaces, NVMe-MI version 1.1.
Ultrastar
DC SN640
Mainstream NVMe™ SSD for Data Center IT and
Cloud Deployment
The Ultrastar DC SN640 NVMe SSD is a mainstream NVMe™ SSD targeting broad
deployment as boot, caching, or primary storage in data center IT and cloud
environments. The DC SN640 is optimized to deliver the highest performance and
consistent QoS read latency when running random mixed workloads typically
generated by enterprise applications such as virtualization, OLTP, NoSQL, web servers,
file servers, and mail servers.
The DC SN640 NVMe SSD is ideal for replacing SATA SSDs by delivering 6x
improvement in sequential read performance and 3x improvement random mixed
read/write performance. The DC SN640 boosts data center performance and
responsiveness as direct attached, distributed storage or in large scale cloud
deployments.
The DC SN640 includes Western Digital’s 96-Layer BiCS4 3D TLC NAND and Western
Digital’s NVMe 1.3c controller and incorporates enterprise reliability features, such
as power-loss protection, end-to-end data path protection, and a five-year limited
warranty.
®
Benefits
• Optimized for performance and latency
consistency on mixed used workloads
• 6x read performance improvement over SATA
SSDs
• Vertically integrated with proven controller
architecture accelerates qualification
Specialized for the Following
Applications
• Boot, cache or storage
• Software Defined Storage
• File, Block and Object Storage applications
• Hyper-converged Infrastructure
• Virtualization
Designed for Workload Flexibility
The Ultrastar DC SN640 is available in two endurance classes: 0.8 DW/D (capacities
from 960GB-7.68TB) and 2 DW/D (capacities 800GB-6.4TB).
The 0.8 DW/D SKU features tunable endurance, giving customers the flexibility to
configure endurance and performance for seasonal burst workloads.
Safeguarding Data
The Ultrastar DC SN640 includes power loss protection to ensure that data is not lost
during unexpected power interruption. It is available with Secure Erase (SE), Instant
Secure Erase (ISE), or TCG Ruby security options. SE and ISE provide entire drive erase
options upon decommissioning. The DC SN640 is available as a self-encrypting drive
with TCG Ruby to provide protection for data in storage and to help meet compliance
criteria.
Better with NVMe
Now is the right time to upgrade from SATA SSDs to NVMe performance in cloud/
hyperscale and on-prem data centers. The Ultrastar DC SN640 NVMe SSD will
help enable lower TCO compared to SATA SSDs, while providing low-latency and
performance for current demanding workloads and future requirements.
Ultrastar® DC SN640
DATA SHEET
Specifications
Model Information
Endurance 2D W/ D 2D W/ D 2D W/ D 2DW/ D 0. 8DW/ D 0. 8DW/ D 0. 8DW/ D 0. 8DW/ D
Capacity 800GB 1,600GB 3,200GB 6,400GB 960GB 1,920GB 3,840GB 7,680GB
Maximum Pet abytes Writ ten 2.92 5.84 11.68 23.36 1.4 2.8 5.61 11.21
Configuration
Interface PCIe Ge n 3.1 x4 (Compliant to NVM e 1.3c)
Form Factor 2.5-inch U.2. 7mm
Flash Memory Technology Western Digita l BiCS 4 3D TLC NAND
Performance
Read Throughp ut (max MB/s, Seq 128 KiB)
TCG Ruby
SE, ISE
Write Thro ughpu t (max MB/s, Seq 128K iB)
TCG Ruby
SE, ISE
Read IOPS (max, Rn d 4KiB)
TCG Ruby
SE, ISE
Write IOPS (max, Rnd 4 KiB)
TCG Ruby
SE, ISE
Read Latency ( s, avg.)
TCG Ruby
SE, ISE
Reliability
Uncorrecta ble Bit Error Ra te (UBER) 1 in 10
MTBF5 (M hours) 2
Annualized Failure Rate (AFR)
Availability
(hrs/day x days/wk)
Limited Warranty6 (years) 5
Power
Requirement (DC +/- 10%) +12V
Opera ting Powe r States ( W, max)
Idle (W, average) < 5W
Physical Size
z-height (mm) 7.00 +0.2/-0.5 (including labels)
Dimensions
(width x le ngth x mm)
Weight (g, max) 95
Environmental
Operating Temperature
Non-Operating Temperature
One giga byte (GB) is eq ual to 1,000MB (one bill ion byte s) due to
operating environment.
Endura nce ratin g based on DW/D using 4KiB 100% ran dom write and
JESD 219 work loads over 5 years.
3
Based on i nternal testing . Perfo rmance w ill var y by capac ity poi nt,
changes in useable capacity, or security option. Consult product
manual f or fur ther det ails. All perfo rmance measure ments ar e in full
sustai ned mode and are pe ak value s. Subje ct to chang e.
4
Average random read latency at 4KiB, QD=1.
3
3340
3310
1200
1180
434K
414K
113K
4
5
108K
79
83
3290
3270
2190
2170
515K
473K
161K
116K
79
85
3330
3330
2040
2010
511K
468K
158K
115K
86
94
3230
3240
1970
1960
496K
469K
149K
116K
87
95
0.4 4%
3330
3320
1190
1180
434K
413K
49K
44K
78
84
3280
3300
2180
2170
515K
472K
88K
63K
78
84
3330
3300
2040
2000
511K
469K
82K
63K
86
94
24×7
10, 11, 12
69.85 (+/- 0.25) x 100.45
7
8
5
MTBF and AF R specification s are base d on a sampl e population
and are estimated by statistical measurements and acceleration
algorithms under typical operating conditions for this drive model.
MTBF and AF R ratings do not pred ict an individua l drive’s reliabili ty
and do not co nstitute a warra nty.
6
The warr anty for the produ ct will expire on th e earlie r of (i) the d ate
when the fl ash media has reac hed one- percent (1%) of i ts remai ning
life or (ii ) the expiration o f the time p eriod associa ted with th e
product.
0°C to 70° C
-40°C to 85°C
7
Composite temperature reading.
8
Values are based on ambient temperature. Avoid non-operational
exposur e to temper atures in e xcess of 40 °C for periods exc eeding
three mo nths.
3250
3250
1980
1970
496K
467K
85K
65K
87
95
Part Number
Endurance 0.8 DW/D Endurance 2 DW/D
Capacity Model Number SE ISE TCG Ruby Capacity Model Number ISE TCG Ruby
960GB WUS4BB096D7P3Ez OTS1960 OTS1927 OTS1849 800GB WUS4CB080D7P3Ez OT S1952 OTS1854
1,92 0G B WUS4BB019D7P3Ez OTS1961 OTS1928 OTS1850 1,600GB WUS4CB016D7P3Ez OTS195 3 OTS1855
3,840GB WUS4BB038D7P3Ez OTS1962 OTS1929 OTS18 51 3,200GB WUS4CB032D7P3Ez OTS1954 OTS 185 6
7,68 0 G B WUS4BB076D7P3Ez OTS1963 OTS1930 OTS1852 6,400GB WUS4CB064D7P3Ez OTS195 5 OTS1857
5601 Great Oaks Pa rkway
San Jose , CA 95119, USA
US ( Toll -F re e) : 1-888-426-5214
www.westerndigital.com
©2021 Wester n Digital Cor poration or it s affiliates . All rights res erved. Wester n Digital, the We stern Digita l logo, and Ultr astar are reg istered trad emarks or tra demarks
of Western D igital C orpor ation or i ts affi liates in th e US and/or othe r countri es. The NV Me word mar k is a trad emark of N VM Expre ss. Inc. A ll other m arks are t he
property of the respective owners. References in this publication to Western Digital products, programs, or services do not imply that they will be made available in
all count ries. Product sp ecifications p rovided a re sampl e specific ations that are su bject to change an d do not constitut e a warran ty. Please v isit the Su pport sectio n
of our website, www.westerndigital.com/support, for additional information on product specifications. Pictures shown may vary from actual products.
z = Encryption Se tting
1 = Secure Erase
3 = Instant Secure Erase
4 = TCG Ruby
02–01-WW-04– 00073-A05 March 2021
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