WD Blue 3D NAND 250GB SATA SSD: features, specs and who it suits

The WD Blue 3D NAND is an internal solid state drive from Western Digital in the 2.5-inch, 7mm SATA format, shown here as a 250GB model (WDS250G3B0A). It is meant for upgrading a laptop or desktop that still uses a hard drive, or for adding a fast secondary drive for everyday programs and files.

Speed: reading the figures

Western Digital rates the drive at sequential reads of up to 560MB/s and sequential writes of up to 530MB/s. Sequential speed describes how quickly large files transfer. The SATA III interface, listed at 6 Gb/s, limits SATA drives to roughly these speeds, so this is near what the connection can deliver. The brand's note also explains its units: one megabyte per second is one million bytes per second.

Compared with a mechanical hard drive, the main day-to-day differences are usually faster start-up, quicker program launches and no moving parts.

What 3D NAND and TBW tell you

3D NAND stacks memory cells vertically. Western Digital says the technology supports capacities up to 4TB in this family and enhanced reliability. The 250GB size is a modest capacity, suited to an operating system and core applications.

Two reliability numbers appear in the listing. TBW means terabytes written, the total amount of data the drive is rated to have written to it over its life; WD cites up to 600TBW, calculated with a JEDEC client workload and varying by capacity, so the 250GB model's figure will be lower than the maximum. MTTF, mean time to failure, is given as 1.75 million hours, based on the brand's internal testing. These are statistical estimates, not a promise for any single drive.

Lower power draw

WD says active power draw is up to 25% lower than earlier WD Blue SSDs, measured during sequential reads at the 500GB capacity. In a laptop, lower power use can mean slightly longer time between charges, though the effect depends on everything else the machine is doing.

Compatibility and warranty

The drive carries WD F.I.T. Lab certification, which Western Digital says is for compatibility with a wide range of computers. It comes with a 5-year manufacturer's limited warranty; check the warranty terms for conditions.

Installing it

At 7mm thick, the 2.5-inch format fits most laptop bays and, with a bracket, standard desktop bays. It measures about 3.9 x 2.8 x 0.3 inches and weighs roughly 0.1 lb. You connect it with a SATA data cable and, in a desktop, a SATA power connector. Many people clone their old drive to it using free or bundled software, or install the operating system fresh.

Who it suits

It suits people refreshing an older laptop or desktop, building a simple system, or wanting a separate drive for the operating system. Anyone who needs to hold large video or game libraries should compare higher capacities.

What to check before you buy

• Connector: confirm your computer has a SATA connection and a 2.5-inch bay.
• Capacity: 250GB is a decimal figure, so the usable space shown by your operating system will be lower.
• Model number: the listing title and model field differ slightly (WDS250G2B0A and WDS250G3B0A), so confirm the exact model you receive.
• Cloning needs: plan how you will transfer your data.
• Backups: keep a separate backup.

The short version

• A 250GB, 2.5-inch, 7mm SATA III internal SSD from Western Digital.
• Up to 560MB/s reads and 530MB/s writes.
• Rated up to 600 TBW at the family level and 1.75 million hours MTTF.
• WD F.I.T. Lab compatibility certification and a 5-year limited warranty.
• Check your drive bay and connector before upgrading.

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