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WD_Black SN7100 4TB NVMe SSD - Gen4 PCIe, M.2 2280, Up to 7,000 MB/s Read Speed, Up to 6,700 MB/s Write Speed, Next Gen TLC 3D NAND, for Laptops, Handheld Gaming Devices - WDS400T4X0E

WD_Black SN7100 4TB NVMe SSD (WDS400T4X0E)

Bottom line: The WD_Black SN7100 4TB NVMe SSD: 4TB capacity fits large modern game libraries plus DLC and updates; main trade-off: peak 7,250/6,900 MB/s speeds apply to 1-2TB models, not this 4TB.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For SSDs and PC storage upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ 4TB capacity fits large modern game libraries plus DLC and updates
  • ✓ Up to 7,000 MB/s read and 6,700 MB/s write on PCIe Gen4
  • ✓ Rated up to 2,400TBW endurance for capture and streaming workloads
  • ✓ Up to 100% better power efficiency than prior gen for handhelds

Cons

  • ✗ Peak 7,250/6,900 MB/s speeds apply to 1-2TB models, not this 4TB
  • ✗ Gen4 interface, so it leaves Gen5 slot bandwidth unused
  • ✗ WD_BLACK Dashboard is Windows-only, no macOS or Linux app
  • ✗ No heatsink listed, so tight laptop or handheld bays may throttle

Manufacturer description

The WD_BLACK SN7100 4TB NVMe SSD is built for gamers who have run out of room and patience. This PCIe Gen4 M.2 2280 drive is rated for up to 7,000 MB/s sequential reads and 6,700 MB/s writes at the 4TB capacity, with WD quoting up to a 35% performance gain over the previous generation on the 1-2TB models that peak at 7,250/6,900 MB/s. Endurance is rated up to 2,400TBW on this 4TB version, which is the headroom you want if you capture gameplay, stream, or work in modern game engines that write large asset caches. Western Digital designed the SN7100 around laptops and handheld gaming devices…

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SpecPicks Verdict

SpecPicks scored WD_Black SN7100 4TB NVMe SSD using a rating × review-volume × price-fit model applied to published specs and reviews across the ssds & storage category. Compare with similarly-priced alternatives in the ssds & storage category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for ssds & storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How fast is the WD_BLACK SN7100 4TB?

The 4TB model is rated for up to 7,000 MB/s sequential read and 6,700 MB/s sequential write over PCIe Gen4. The 1-2TB models are rated slightly higher at 7,250 MB/s read and 6,900 MB/s write.

Will it fit in a Steam Deck or other handheld?

It is an M.2 2280 drive, and WD states it was designed with laptops and handheld gaming devices in mind. Confirm your handheld accepts the 2280 length, since several handhelds use the shorter 2230 form factor.

How much writing can this drive handle before it wears out?

The 4TB model is rated up to 2,400TBW of endurance, which is aimed at gameplay streaming, speedrun captures, and large game-engine projects.

Do I need a PCIe Gen5 motherboard to use it?

No. The SN7100 is a PCIe Gen4 drive and runs in a Gen4 M.2 slot at full speed. It will also work in a Gen5 slot, but it will not exceed its Gen4 rated speeds.

Is there software to manage the drive?

Yes, the downloadable WD_BLACK Dashboard handles optimization and drive health, but it is Windows only. Check the product listing for current warranty terms.

Key Features

  • HIGH-OCTANE GAMING. Experience speeds up to 7,250MB/s read and 6,900MB/s write (1-2TB models), with up to 35% faster performance than previous generation.
  • PURPOSE-BUILT. Designed for serious on-the-go gamers, with a PCIe Gen4 interface and SANDISK’s next generation TLC 3D NAND.
  • MORE SPACE FOR FAVORITES AND NEW TITLES. Available in multiple capacities up to 4TB, upgrade to an SSD that gives you tons of storage.
  • MORE TIME TO CLEAR THAT CHECKPOINT. Built with laptops and handheld gaming devices in mind, with up to 100% more power efficiency over the previous generation. DO MORE WITH DASHBOARD. Ensure your drive is optimized for prime performance with the downloadable WD_BLACK Dashboard (Windows only).
  • AMPLIFY YOUR CONTENT. Up to 2,400TBW endurance (4TB model) for gameplay streaming, speedrun captures, or creating with the latest game engines.
  • POWERED BY SANDISK: The WD_BLACK, WD Blue, and WD Green flash products are manufactured by Sandisk Technologies, Inc. or its affiliates and distributed under license from Western Digital Corporation.

Full Specifications

BrandSandisk
ColorBlack
Model NameWD_BLACK SN7100 NVMe SSD
Read Speed7000 megabytes_per_second
Unit Count1 Count
Form FactorM.2 2280
Media Speed6900 MB/s
Model NumberWDS400T4X0E-00CJA0
Built-In MediaWD_BLACK SN7100 NVMe SSD
Hard-Drive Size4 TB
Mfr Part NumberWDS400T4X0E
Number of Items1
Special FeaturePCIe Gen4 NVMe
Hardware PlatformPC
Installation TypeInternal Hard Drive
Compatible DevicesDesktop, Handheld Gaming Console, Laptop
Data Transfer Rate7000 megabytes_per_second
Enclosure MaterialInformation Not Available
Additional FeaturesPCIe Gen4 NVMe
Hard Disk InterfacePCIE x 4
Full listing titleWD_Black SN7100 4TB NVMe SSD - Gen4 PCIe, M.2 2280, Up to 7,000 MB/s Read Speed, Up to 6,700 MB/s Write Speed, Next Gen TLC 3D NAND, for Laptops, Handheld Gaming Devices - WDS400T4X0E

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WD_Black SN7100 4TB NVMe SSD - Gen4 PCIe, M.2 2280, Up to 7,000 MB/s Read Speed, Up to 6,700 MB/s Write Speed, Next Gen TLC 3D NAND, for Laptops, Handheld Gaming Devices - WDS400T4X0E is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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WD_Black SN7100 4TB NVMe SSD - Gen4 PCIe, M.2 2280, Up to 7,000 MB/s Read Speed, Up to 6,700 MB/s Write Speed, Next Gen TLC 3D NAND, for Laptops, Handheld Gaming Devices - WDS400T4X0E
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