Western Digital WD Black SN8100 4TB

Name: Western Digital WD Black SN8100 4TB
Brand: Western Digital
SKU: 2981

Manufacturer: Western Digital

The Western Digital WD Black SN8100 4TB is a high-capacity M.2 NVMe solid-state drive built around the PCIe 5.0 interface and NVMe 2.0 protocol. It ships with 4,000GB of usable storage and relies on a DRAM cache to support consistent data access under sustained workloads. The drive uses TLC NAND storage and foregoes an integrated heatsink or RGB lighting, keeping its profile straightforward and focused on raw performance.

Underpinning the SN8100 is the Silicon Motion SM2508 controller, which operates across 8 channels to coordinate data flow efficiently. Sequential read and write speeds reach 14,900 MB/s and 14,000 MB/s respectively, while random performance is rated at 2,300,000 read IOPS and 2,400,000 write IOPS. The drive recorded a PassMark SSD score of 90,689 and carries a rated endurance of 2,400 TBW, backed by a five-year warranty.

Pros

Sequential read and write speeds of 14,900 MB/s and 14,000 MB/s respectively indicate very fast data transfer for large files
Random write performance reaches 2,400,000 IOPS, supporting demanding workloads that involve frequent small-file operations
The DRAM cache helps maintain consistent access speeds under sustained load
A TBW rating of 2,400 means the drive is rated for substantial long-term write endurance
PCIe 5.0 and NVMe 2.0 support reflect a modern interface specification
The five-year warranty provides extended coverage for long-term use

Cons

No integrated heatsink, which may require additional cooling solutions in thermally constrained builds
TLC NAND, while common, offers lower write endurance per cell compared to MLC-based alternatives
The M.2 form factor requires a compatible slot, limiting use in systems without PCIe 5.0 M.2 support

Who is this for?

This drive is well-suited for users who need high-throughput storage for large file workloads, such as video editors, 3D rendering professionals, or developers working with substantial datasets that benefit from sequential read and write speeds of 14,900 MB/s and 14,000 MB/s. The 4,000GB capacity combined with a 2,400 TBW endurance rating also makes it a practical choice for content creators or power users who write large volumes of data regularly and need a drive that can sustain that over time. Systems built around PCIe 5.0 M.2 slots will get the most from its modern interface and NVMe 2.0 support.

Who is this NOT for?

Users with systems that lack a PCIe 5.0 M.2 slot will not be able to fully utilize this drive's interface capabilities, making it a poor fit for older platforms. The absence of an integrated heatsink may also make it less suitable for small form factor or passively cooled builds where thermal management is limited and sustained workloads could lead to throttling. Additionally, users who only perform light, everyday computing tasks such as basic browsing or document editing would have little practical use for the drive's high IOPS ratings and bandwidth capacity.

Read speed:

sequential read speed	14900 MB/s
random read speed	2300000 IOPS

The WD Black SN8100 4TB delivers a sequential read speed of 14,900 MB/s, making it well-suited for large file transfers and data-intensive tasks. On the random side, it reaches 2,300,000 read IOPS, reflecting strong performance when accessing smaller, scattered data across the drive.

Write speed:

sequential write speed	14000 MB/s
random write speed	2400000 IOPS

The SN8100 4TB supports a sequential write speed of 14,000 MB/s, handling large, continuous data writes at a sustained pace. Its random write performance reaches 2,400,000 IOPS, indicating strong throughput when dealing with fragmented or mixed write workloads across the drive.

Benchmarks:

PassMark result	90689

In the PassMark SSD benchmark, the WD Black SN8100 4TB recorded a score of 90,689, providing a standardized reference point for evaluating its overall storage performance.

General info:

type	M2
SSD cache	DRAM cache
Is an NVMe SSD	✓
NVMe version	2
internal storage	4000GB
controller	Silicon Motion SM2508
SSD storage type	TLC
PCI Express (PCIe) version	5
Controller channels	8
Terabytes Written (TBW)	2400
warranty period	5 years
Has an integrated heatsink	✕
has RGB lighting	✕

The WD Black SN8100 4TB is an M.2 NVMe SSD operating over a PCIe 5.0 interface with NVMe 2.0 support, offering 4,000GB of internal storage built on TLC NAND. It is powered by the Silicon Motion SM2508 controller across 8 channels and includes a DRAM cache to support consistent data handling. The drive carries a TBW rating of 2,400, meaning it is rated to sustain up to 2,400 terabytes of written data over its lifetime, and comes backed by a 5-year warranty. It does not include an integrated heatsink or RGB lighting.

Final Verdict

The Western Digital WD Black SN8100 4TB is a well-specified M.2 NVMe drive built for users who demand serious storage throughput, with its PCIe 5.0 interface and sequential speeds reaching 14,900 MB/s placing it firmly in the upper tier of consumer SSD specifications. Backed by a 2,400 TBW endurance rating, DRAM caching, and a five-year warranty, it is designed to handle sustained, high-intensity workloads over the long term. The lack of an integrated heatsink and its dependency on a compatible PCIe 5.0 platform mean it is best suited to purpose-built systems rather than general-purpose upgrades. For users with the right hardware environment and genuinely demanding storage needs, the SN8100 4TB represents a technically complete and durable option.