WD Blue SN580 1TB NVMe SSD (WDS100T3B0E): PCIe Gen4 specs and who it suits

The WD Blue SN580 1TB (model WDS100T3B0E) is an internal NVMe solid state drive that uses PCIe Gen4 in the compact M.2 2280 format. Western Digital positions it for creators and professionals who want a quicker drive for a desktop or laptop, with low power use.

What PCIe Gen4 and NVMe mean

NVMe is the protocol that lets a drive talk directly to the processor over PCIe lanes, instead of through the older SATA interface. This reduces delays and raises throughput. The drive uses a Gen4 x4 connection, and the listing quotes 16Gb/s for the interface. Western Digital lists read speeds of up to 4,150MB/s for the 1TB and 2TB models, based on internal testing, with the company noting that results vary with the host device, usage and capacity.

For comparison, SATA SSDs top out at around 550MB/s. The real-world difference is most obvious when copying large files, such as video footage and big photo libraries, and when loading big projects. Everyday tasks may feel similar.

nCache 4.0

The listing mentions nCache 4.0, Western Digital's caching technology. Drives of this type use part of their flash memory as a fast write buffer, so large copies start quickly. Once that buffer fills, speeds typically drop to the drive's sustained rate, so very long transfers may be slower than the headline figures.

Capacity and form factor

The SN580 range goes up to 2TB, and this model has 1TB. The M.2 2280 size is about 3.1 inches (80 mm) long and 0.9 inches (22 mm) wide, which fits most modern desktop motherboards and many laptops. Western Digital notes that 1TB equals one trillion bytes, so formatted capacity shown by the operating system is lower.

Low power use

The listing highlights low-power storage to help maximize a laptop's battery life. Lower power draw also means less heat, which is helpful in thin laptops where room for a heatsink is limited.

Endurance and warranty

Western Digital describes a five-year limited warranty, or until the maximum endurance (TBW) limit is reached, whichever comes first. The listing's 900TBW figure applies to the 2TB model only. TBW is the total amount of data that can be written to the drive over its life, calculated by Western Digital with a JEDEC client workload, and it varies with capacity.

Who it suits

It suits people upgrading from a hard disk or older SATA SSD, builders who want a Gen4 boot or storage drive, and laptop owners looking for an efficient replacement drive. It will also work in many Gen3 slots, but at lower speeds, and you should check your device's compatibility.

What to check before you buy

• Slot type: confirm that your device has an M.2 2280 slot that supports NVMe, not just SATA M.2.
• PCIe generation: a Gen3 slot limits the speed.
• Fit: check clearance and whether your laptop or console needs a heatsink or a particular height.
• Cloning: if replacing a drive, plan how to move your operating system and files.
• Capacity: usable space is slightly lower than 1TB.

The short version

• A 1TB PCIe Gen4 x4 NVMe SSD in the M.2 2280 format, model WDS100T3B0E.
• Read speeds of up to 4,150MB/s, per Western Digital.
• nCache 4.0 and low-power design.
• Five-year limited warranty, or until the TBW limit.

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