WDS400T3B0A Western Digital Blue SA510 4TB SATA-6GBPS 2.5 Inch 7MM Internal SSD

The WD Blue SA510 4TB SATA SSD for Power Users

The Western Digital Blue SA510 4TB (WDS400T3B0A) is a high-capacity, 2.5-inch SATA III solid state drive designed for users who want a fast, reliable storage upgrade for laptops and desktop PCs. It pairs familiar SATA convenience with large 4TB capacity, delivering an easy path to move away from spinning hard drives toward solid-state performance. This section explains the drive’s key technical details, who it’s best for, and how to evaluate it against other options on the market.

Key selling points include the 2.5" / 7mm form factor (fits most laptops and desktops with a SATA bay), a SATA III 6 Gb/s interface for broad compatibility, and sequential read/write speeds that push the limits of SATA. These attributes make the WD Blue SA510 a practical, low-risk upgrade for storage-hungry creators, prosumers, and everyday users who want simple, reliable SSD performance.

Compact 2.5" form factor

The WD Blue SA510 uses the standard 2.5-inch drive size with a slim 7mm height. That means it will fit in almost every laptop that accepts a 2.5" drive, and it mounts easily into desktop SSD brackets or dedicated drive cages. The compact build keeps the drive light and minimally intrusive inside the case, while maintaining the durability and vibration resistance expected from SSDs.

7mm matters

Many thin laptops require a 7mm drive profile. If you are upgrading an older laptop that previously held a mechanical 2.5" HDD, the WD Blue SA510 fits without adapters in most cases. For ultrabooks or very slim notebooks that only accept M.2, you will need a different form factor, but for mainstream laptops and desktops the 2.5" / 7mm design remains the most compatible choice.

Sequential read and write speeds

The WD Blue SA510 achieves sequential read speeds up to approximately 560 MB/s and sequential write speeds up to about 520 MB/s on many capacity points, which is close to the practical ceiling for SATA III. These sequential numbers are what you will generally see when moving large files like video projects, disk images, or large backups. Because SATA III tops out just above 600 MB/s in real-world use, the SA510’s performance extracts nearly the full bandwidth available on the interface.

Random I/O

For everyday tasks — booting the OS, launching apps, browsing, and handling lots of small files — random read/write IOPS matter most. The WD Blue SA510 offers strong 4K random read/write performance in the tens of thousands of IOPS (typical figures around 80k–90k read IOPS and similar write IOPS for higher-capacity models). This translates into snappier responsiveness compared to traditional HDDs and older SSDs, especially when running multiple apps or working on medium-size projects.

Capacity & Endurance

4TB for creators and heavy users

A 4TB SSD like the WDS400T3B0A moves many workflows from juggling external drives into one internal storage pool. Photographers, video editors, large-game collectors, and users with sizeable project files will find 4TB convenient and time-saving. Moving projects to an internal SSD eliminates USB bottlenecks and simplifies backup strategies.

Endurance (TBW) and reliability expectations

Western Digital publishes endurance ratings and TBW (terabytes written) figures for each model; these reflect how much data you can write over the drive’s useful life. The SA510 family shows endurance designed for mainstream consumer workloads—sufficient for years of normal usage. If your workload is heavy continuous writes (server-style workloads or constant video recording), check the TBW for the exact capacity you plan to buy and consider a higher-enduranc

Comparisons

WD Blue SA510 vs. entry-level HDD

Compared to a mechanical 2.5" HDD, the SA510 delivers much lower latency, faster file transfers, almost silent operation, better shock resistance, and lowe result is a noticeably more responsive system and longer battery life in laptops.

WD Blue SA510 vs. NVMe SSDs

NVMe PCIe drives (M.2) can be several times faster than SATA SSDs in sequential and random workloads, especially in high-end models. However, the SA510’s advantages are compatibility and cost-per-gigabyte: many systems don’t have an available M.2 slot, and high-capacity NVMe drives often cost substantially more. The SA510 is a balanced choice when you need large capacity without the premium price of high-capacity NVMe options.

Comparing within WD Blue family

WD Blue offers several SATA and M.2 variants. Pick the 2.5" SA510 if you need a SATA form factor and large capacity. If you have an M.2 slot and want a lower-profile install with potentially faster M.2 SATA/NVMe options, check the M.2 members of the Blue lineup. Also evaluate endurance (TBW) and warranty differences across capacity points before buying.