Western Digital WUS4BB038D7P3E3 User Manual
Ultrastar
®
DC SN640
DATA SH E E T
Ultrastar DC SN640 NVMe SSDs for Data Centers
The DC SN640 comes standard with the ability
to sanitize the drive using Instant Secure Erase
(ISE). Using cryptographic techniques, user data
can be instantly erased for easy re-deployment
or device retirement. The DC SN640 supports
AES-256 bit data encryption and of fers encryption
management functionality that complies with TCGRuby specification. Device security is provided by
requiring signed firmware downloads and a secure
boot feature ensuring that only authentic firmware
can operate your device.
NVMe SSDs FOR DATA CENTERS
96-Layer BiCS4 NAND
Purpose-Built NVMe SSDs for Scale-Out Storage
The Ultrastar® DC SN640 is Western Digital’s data center SSD, purpose built to deliver
high performance and advanced NVMe features across multiple form factors geared
to support a variety of data center workloads. Leveraging its rich heritage of enterprise
storage technology, Western Digital developed a fully vertically integrated SSD that
utilizes industry-leading 96-Layer BiCS4 NAND coupled with an advanced in-house
NVMe controller that is optimized for low latency and power ef ficiency. Delivering
capacities of up to 30.72TB the DC SN640 meets the growing demand for capacity
scaling of flash storage within the data center.
NVMe Performance
NVMe is quickly becoming the interface of choice for high performance storage. The
SATA interface was traditionally less expensive to deploy, but comes with an inherent
bandwidth bottleneck around 550MB/s. Single port NVMe SSDs offer a competitive
alternative and investing in NVMe provides a large benefit by offering over 5x SATA
read performance with transfers up to 3 GB/s and almost 4x the write per formance
with transfers up to 2 GB/s. With up to four PCIe lanes assigned to each SSD drive and
directly connected to the CPU, you can maximize storage performance compared to a
single SATA lane.
More Form Factors Options
The DC SN640 will be available in three form factors: 7mm U.2, M.2, and E1.L (EDSFF-L).
The 2.5” U.2 form factor is most popular option for deploying flash storage. The slim
7mm width (vs 15mm alternatives) enables higher density deployments in 1U servers.
The M.2 22×110mm compact form factor can be deployed in servers as stand-alone
option or via an add-in-card module such as the Open Compute Project (OCP) AVA
HH-HL adapter that supports up to four M.2 drives. E1.L is a variant of the new EDSFF
industry standard that is designed for dense data center usage and a new future proof
connector capable of supporting future PCIe Gen 5 devices. E1.L physically provides
both more room for flash (translating to higher capacity points, up to 30.72TB), and
includes heat sink design to support higher power modes.
Advanced Features
The Ultrastar DC SN640 is feature rich, supporting up to 128 NVMe namespaces.
Managing deployed devices is made easier by suppor ting all mandatory commands in
the NVME Management Interface (NVMe-MI), and allowing firmware updates without a
device reset.
Software defined storage demands flexibility. The DC SN640 offers enhanced flexibility
by allowing a tradeof f of capacity for endurance, and can thus be tuned for the specific
application being deployed. Read-intensive use-cases often require 0.8 Drive Writes
per Day (DW/D), which translates to 2.8 petabytes written over 5 years (PBW) for a
1.92TB drive. Using a simple resize operation to reduce capacity from 1.92TB to 1.6TB will
double the drive’s endurance from 0.8 DW/D (2.8PBW) to 2.0 DW/D (5.8PBW).
Ultrastar
®
DC SN640
DATA SH E E T
Specifications
2.5-inch U.2 Form Factor M.2 22×110mm Form Factor
NVMe SSDs FOR DATA CENTERS
Enterprise and Data Center Small
Form Factor (EDSFF)
Capacity
0. 8 DW/ D 960GB, 1.92TB, 3.84TB, 7.68TB 960GB, 1.92TB, 3.84TB 7.68TB, 15.36TB, 30.72TB
2.0 DW/D 800GB, 1.6TB,3.2TB, 6.4TB
Active Power (max) 12W 8.25W 20W
NAND Western Digital 96L BiCS4 3D TLC
NVMe PCIe Gen3 x4
Endurance 0.8, 2.0 DW/D over 5 years
Sequential Read/Write Projected Up to 3.0GiB/s / 2.0 GiB/s
Random Read Projected Up to 480K I OPs
Random Write Projected Up to 120K IOPs
Random (70/30) Mixed Projected Up to 240K IOPs
Reliability (MTBF) 2 Million Hours
Reliability (UBER) 1 in 10 bits read
Warranty 5 years
U.2 M.2 E1.L
One gig abyte (GB) is equal to 1,000M B (one billion bytes) and one teraby te (TB) is equal to 1,000GB (one tril lion by tes), and one petabyte (PB) is equal to 1,0 00TB whe n
referr ing to solid-state capacit y. Accessible cap acity will var y from the stated cap acity due to operatin g enviro nment .
Note that ISE does n ot offer data encr yption to protec t data at rest.
Endurance rat ing bas ed on 100% 4KiB Ran dom Write worklo ad.
Actual p erforman ce subject to change and will vary by cap acit y point or with the changes in useable ca pacit y. Consul t produ ct manual for f urth er det ails. B ased on f ull
sustained mode and peak values. Sequential performance based on 128KiB and random performance based on 4KiB transfers. 1MiB= 1,048,576 bytes or 1KiB= 1,024 bytes.
Values sh own are for 6.4TB capacity i n U.2 form facto r.
MTBF and AFR targ ets are based on a sampl e population a nd are es timated by statistical measurem ent and a cceleration algorithms under me dian operating cond ition s.
MTBF and AFR rating do not predic t an indi vidua l drive’s re liabi lity a nd do not constitute a war ranty.
The les ser of 5 yea rs from the date of manuf acture of the product or the date on whic h the product’s relevant endurance thresho lds set f orth i n the pro duct specifi cations
are reac hed.
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International: 408.717.6000
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© 2019 Western Digital Corporation or its affiliates. All rights reserved. Western Digital, the Western Digital logo, and iNAND are registered trademarks or trademarks of
Western Digital Corporation or its affiliates in the U.S. and/or other countries. All other marks are the property of their respective owners. Pictures shown may vary from
actual products. References in this publication to Western Digital products, programs, or services do not imply that they will be made available in all countries. Product
specifications provided are sample specifications that are subject to change and do not constitute a warranty. Visit our website, http://www.westerndigital.com for
additional information on product specifications.
02–05-WW-04– 00170 v1.0 October 2019
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