What form factor does the drive use?

It uses a U.2 2.5-inch form factor. This is important for confirming fit in systems designed for enterprise 2.5-inch NVMe bays and backplanes.

What interface does it support?

The listed interface is PCIe Gen 3.1, and the drive is NVMe 1.3 compliant. The product data also identifies dual-port support, which is relevant for enterprise storage designs.

What NAND technology is used?

The product data specifies 96-layer 3D TLC NAND. That gives buyers a clear view of the drive’s flash architecture when comparing enterprise NVMe SSD options.

What reliability figures are provided?

The listed MTBF is 2.5 million hours, and the annualized failure rate is 0.35 percent. The product data also states 24x7 availability, which supports continuous-operation use cases.

WUS4BA138DSP3X4 - Western Digital WUS4BA138DSP3X4 3.84TB U.2 NVMe SSD

Name: Western Digital WUS4BA138DSP3X4 3.84TB U.2 NVMe SSD
Brand: Western Digital
SKU: WUS4BA138DSP3X4

WUS4BA138DSP3X4 - Western Digital WUS4BA138DSP3X4 3.84TB U.2 NVMe SSD | US IT Hardware

Product overview

The Western Digital Ultrastar DC SN840, model WUS4BA138DSP3X4, is an enterprise solid state drive in the U.2 2.5-inch form factor. It provides 3.84TB of capacity and is part of Western Digital’s Ultrastar DC SN840 family for data center use. The drive uses a PCIe Gen 3.1 interface with dual-port support and is NVMe 1.3 compliant. It is built on 96-layer 3D TLC NAND. According to the product data, the SN840 line is available in multiple endurance classes, including 1 DWPD and 3 DWPD options, and supports security features such as Secure Erase, Instant Secure Erase, TCG Ruby, and FIPS 140-2 validation. It is specified for enterprise reliability with an MTBF of 2.5 million hours, an annualized failure rate of 0.35 percent, and 24x7 availability. The listed power input is 12V and 3.3V with a tolerance of plus or minus 15 percent.

3.84TB enterprise SSD capacity
U.2 2.5 inch form factor
PCIe Gen 3.1 NVMe 1.3
Dual-port enterprise design
96-layer 3D TLC NAND
MTBF 2.5M hours

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Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Manufacturer part #	WUS4BA138DSP3X4
Brand	Western Digital
Condition	New
Model	WUS4BA138DSP3X4
Series	Ultrastar DC SN840
Capacity	3.84 TB
Use Case	Enterprise and data center applications including virtualization, pattern recognition and other high-performance workloads
Generation	3rd generation Western Digital performance NVMe SSD for data center
Form Factor	2.5 inch U.2, 15 mm
Drive Height	15 mm
Product Line	Ultrastar DC SN840

Best for

Enterprise storage
Suitable for enterprise storage systems that use a 2.5-inch U.2 SSD form factor. The 3.84TB capacity and NVMe 1.3 compliance fit deployed storage environments that require standardized solid state drive integration.
NVMe platforms
Fits platforms designed for PCIe Gen 3.1 NVMe drives with dual-port support. The interface details make it relevant for systems that need NVMe connectivity in a U.2 bay.
Data centers
Built for data center deployment as part of the Ultrastar DC SN840 enterprise line. The listed 24x7 availability and MTBF of 2.5 million hours align with continuous-operation environments.

Frequently asked questions

What is the storage capacity of this SSD?

The drive has a capacity of 3.84TB. That capacity is listed for the Western Digital Ultrastar DC SN840 model WUS4BA138DSP3X4 and places it in the enterprise SSD category for data center deployments.

Details

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NVMe Enterprise & Data Center SSDs 3.84TB Enterprise SSDs 2.5-inch Enterprise SSDs Enterprise SSDs

Product Type	Solid state drive

Encryption Type	AES-256 hardware encryption

Application Class	Enterprise data center SSD

Performance Class	Performance NVMe SSD for data center

Security Features	AES-256 encryption engine with Secure Erase (SE), Instant Secure Erase (ISE) and TCG Ruby

Security Suite Name	TCG Ruby

Power Loss Protection	Enterprise-class power loss protection circuitry

Sequential Read (MBps)	3470 MB/s

Annualized Failure Rate	0.35 percent

Sequential Write (MBps)	3250 MB/s

Security Option Description	Instant Secure Erase (ISE) enables cryptographic erase of user data

Maximum Sequential Read (datasheet rating)	up to 3470 MB/s

Maximum Sequential Write (datasheet rating)	up to 3330 MB/s

Performance

MTBF	2.5 million hours
Endurance Class	1 drive write per day (1 DWPD) for 5 years
NAND Flash Type	3D TLC
Endurance Rating	1 DWPD
Random Read (4KB) IOPS	780K IOPS
Random Write (4KB) IOPS	159K IOPS
Maximum Interface Bandwidth	4 GB/s
Mixed Random 70/30 Read Write IOPS	up to 503K IOPS

Networking Ports & Interfaces

Interface	PCIe Gen 3.1 x4 NVMe
Host Interface	PCIe Gen 3.1 x4 U.2
PCIe Generation	PCIe Gen 3.1
Dual Port Support	Dual port NVMe
U.2 Connector Type	U.2 2.5-inch enterprise SSD connector
NVMe Version Support	Compliant with NVMe 1.3c
Dual Port Architecture	Dual-port high availability supporting two redundant data paths to the SSD
PCIe Lane Configuration	1x4 or 2x2 lane configurations
Drive Interface Standard	NVMe 1.3c

Western Digital WUS4BA138DSP3X4 3.84TB U.2 NVMe SSD