Ultrastar DC SN640
2.5-inch Performance NVMe Solid State Drive (SSD)

Overview

The Dynamic Data Center Environment With a Western Digital Ultrastar DC SN640 SSD

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.

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 1.3 controller and incorporates enterprise reliability features, such as power-loss protection, end-to-end data path protection, and a five-year limited warranty.

Designed for Workload Flexibility

The Ultrastar DC SN640 is available in two endurance classes: 0.8 DW/D² (capacities from 960GB-7.68TB)¹ and 2 DW/D² (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 Eraser (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 no-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.

¹ One megabyte (MB) is equal to one million bytes, one gigabyte (GB) is equal to 1,000MB (one billion bytes), one terabyte (TB) is equal to 1,000GB (one trillion bytes), and one petabyte (PB) is equal to 1,000TB. Actual user capacity may be less due to operating environment.
² Endurance rating based on DW/D using 4KiB 100% random write and JESD 219 workloads over 5 years.

Specifications

Capacity	800GB	1,600GB	3,200GB	6,400GB	960GB	1,920GB	3,840GB	7,680GB
Endurance2	2DW/D	2DW/D	2DW/D	2DW/D	0.8DW/D	0.8DW/D	0.8DW/D	0.8DW/D
Maximum Petabytes Written2	2.92	5.84	11.68	23.36	1.4	2.8	5.61	11.21
Configuration
Interface	PCIe 3.11x4 (Compliant to NVMe 1.3c)
Form Factor	2.5-inch U.2 7mm
Flash Memory Technology	Western Digital BiCS4 3D TLC NAND
Performance3
Read Throughput (max MB/s, Seq 128KiB)	TCG Ruby: 3340 SE, ISE: 3310	TCG Ruby: 3290 SE, ISE: 3270	TCG Ruby: 3330 SE, ISE: 3330	TCG Ruby: 3230 SE, ISE: 3240	TCG Ruby: 3330 SE, ISE: 3320	TCG Ruby: 3280 SE, ISE: 3300	TCG Ruby: 3330 SE, ISE: 3300	TCG Ruby: 3250 SE, ISE: 3250
Write Throughput (max MB/s, Seq 128KiB)	TCG Ruby: 1200 SE, ISE: 1180	TCG Ruby: 2190 SE, ISE: 2170	TCG Ruby: 2040 SE, ISE: 2010	TCG Ruby: 1970 SE, ISE: 1960	TCG Ruby: 1190 SE, ISE: 1180	TCG Ruby: 2180 SE, ISE: 2170	TCG Ruby: 2040 SE, ISE: 2000	TCG Ruby: 1980 SE, ISE: 1970
Read IOPS (max, Rnd 4KiB)	TCG Ruby: 434K SE, ISE: 414K	TCG Ruby: 515K SE, ISE: 473K	TCG Ruby: 511K SE, ISE: 468K	TCG Ruby: 496K SE, ISE: 469K	TCG Ruby: 434K SE, ISE: 413K	TCG Ruby: 515K SE, ISE: 472K	TCG Ruby: 511K SE, ISE: 469K	TCG Ruby: 496K SE, ISE: 467K
Write IOPS (max, Rnd 4KiB)	TCG Ruby: 113K SE, ISE: 108K	TCG Ruby: 161K SE, ISE: 116K	TCG Ruby: 158K SE, ISE: 115K	TCG Ruby: 149K SE, ISE: 116K	TCG Ruby: 49K SE, ISE: 44K	TCG Ruby: 88K SE, ISE: 63K	TCG Ruby: 82K SE, ISE: 63K	TCG Ruby: 85K SE, ISE: 65K
Read Latency (avg.)4	TCG Ruby: 79 SE, ISE: 83	TCG Ruby: 79 SE, ISE: 85	TCG Ruby: 86 SE, ISE: 94	TCG Ruby: 87 SE, ISE: 95	TCG Ruby: 78 SE, ISE: 84	TCG Ruby: 78 SE, ISE: 84	TCG Ruby: 86 SE, ISE: 94	TCG Ruby: 87 SE, ISE: 95
Reliability
Uncorrectable Bit Error Rate (UBER)	1 in 1017
MTBF5 (M hours, projected)	2M hours
Annualized Failure Rate5 (AFR, projected)	0.44%
Availability (hrs/day x days/wk)	24x7
Limited Warranty6	5 years
Power
Requirement (DC +/- 5%)	+12VDC +/- 10%
Operating (max)	10W, 11W, 12W
Idle	< 5W
Environmental
Operating Temperature7	0° to 70°C (Case)
Non-operating Temperature8	-40° to 85°C
Physical Dimensions
z-height	7.00 mm +0.2/0.5 (including labels)
Dimensions (width x depth)	69.85 (+/- 0.25) x 100.45
Weight (max)	95 g

¹ One MB is equal to one million bytes, one GB is equal to one billion bytes and one TB equals 1,000GB (one trillion bytes). Actual user capacity may be less due to operating environment.
² Endurance rating based on DW/D using 4KiB 100% random write and JESD 219 workloads over 5 years.
³ Based on internal testing. 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. Subject to change.
⁴ Average random read latency at 4KiB, QD=1
⁵ MTBF and AFR specifications will be based on a sample population and are estimated by statistical measurements and acceleration algorithms under typical operating conditions for this drive model. MTBF and AFR ratings do not predict an individual drive's reliability and do not constitute a warranty.
⁶ The warranty for the product will expire on the earlier of (i) the data 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.
⁷ Composite temperature reading.
⁸ Values are based on amibient temperature. Avoid non-operational exposure to temperatures in excess of 40°C for periods exceeding three months.

Documentation

Download the Western Digital Ultrastar DC SN640 Datasheet (.PDF)