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Western Digital WD Black SN7100 500GB specifications and in-depth review

Western Digital WD Black SN7100 500GB

Manufacturer: Western Digital

The Western Digital WD Black SN7100 500GB is an M.2 NVMe solid-state drive built around a PCIe 4.0 interface and Western Digital's Polaris 3 controller. Aimed at users who need consistent throughput without unnecessary extras, it ships without an integrated heatsink or RGB lighting, keeping the focus firmly on raw storage performance. The drive carries a five-year warranty and is rated for operation up to 85 °C.

On the performance side, the SN7100 reaches 6800 MB/s sequential read and 5800 MB/s sequential write, while random workloads are handled through Host Memory Buffer caching rather than dedicated DRAM. Random reads top out at 760,000 IOPS and random writes at 1,200,000 IOPS, with the four-channel Polaris 3 controller coordinating the TLC NAND. The drive scored 38,921 on the PassMark SSD benchmark, operates on NVMe version 1.4, and carries a 300 TBW endurance rating. Hardware-level AES encryption is not supported on this model.

Pros
  • Sequential read and write speeds of 6800 MB/s and 5800 MB/s respectively indicate strong throughput for sustained data transfers
  • Random write performance of 1,200,000 IOPS reflects solid responsiveness under workloads involving frequent small-block writes
  • The five-year warranty period offers meaningful long-term coverage for a storage device
  • A 300 TBW endurance rating provides a clear and documented measure of the drive's write longevity
  • Uses the PCIe 4.0 interface with NVMe 1.4, enabling the bandwidth headroom needed for high-throughput tasks
  • The four-channel Polaris 3 controller coordinates TLC NAND efficiently without requiring dedicated onboard DRAM
Cons
  • Host Memory Buffer caching relies on system RAM rather than dedicated DRAM, which may affect consistency under sustained mixed workloads
  • No hardware AES encryption support, leaving users without an onboard security layer for stored data
  • The absence of an integrated heatsink means thermal management depends entirely on the host system's airflow and cooling
  • TLC NAND generally offers lower write endurance per cell compared to MLC-based alternatives, which is reflected in the 300 TBW ceiling for a 500GB capacity
Who is this for?

This drive is well-suited to users who regularly handle large sequential workloads such as video editing, game loading, or transferring substantial files, where its 6800 MB/s read and 5800 MB/s write speeds can be meaningfully utilized. The 1,200,000 random write IOPS also make it a practical fit for active desktop systems running demanding applications that generate frequent small-block writes. With a five-year warranty and a PCIe 4.0 M.2 form factor, it fits naturally into modern desktop or laptop builds where a standardized, high-bandwidth NVMe slot is available and long-term reliability coverage matters.

Who is this NOT for?

Users with strict data security requirements will find this drive lacking, as it offers no hardware AES encryption, making it unsuitable for environments where onboard storage-level security is a baseline requirement. Those building systems in thermally constrained cases without active airflow may also run into issues, since the drive includes no integrated heatsink and must rely entirely on the host system for thermal management. Additionally, workloads that demand sustained peak performance under mixed read/write conditions may expose the limitations of Host Memory Buffer caching, which draws on system RAM rather than dedicated DRAM and can be less consistent under prolonged, cache-saturating tasks.

Read speed:

sequential read speed 6800 MB/s
random read speed 760000 IOPS

The WD Black SN7100 500GB delivers a sequential read speed of 6800 MB/s, making it well-suited for large file transfers and data-intensive workloads. On the random side, it reaches 760,000 IOPS, reflecting solid responsiveness when handling the kind of fragmented, small-block reads typical of everyday system tasks and application loading.

Write speed:

sequential write speed 5800 MB/s
random write speed 1200000 IOPS

For write operations, the WD Black SN7100 500GB is rated at a sequential write speed of 5800 MB/s, suitable for sustained data writing tasks. Its random write performance reaches 1,200,000 IOPS, indicating strong handling of the small, scattered write operations commonly generated by operating systems and active applications.

Benchmarks:

PassMark result 38921

The WD Black SN7100 500GB achieved a PassMark score of 38,921, providing a standardized reference point for its overall storage performance as measured by the PassMark benchmarking tool.

General info:

type M2
SSD cache HMB (Host Memory Buffer)
Is an NVMe SSD ✓
NVMe version 1.4
internal storage 500GB
controller Polaris 3 A101-000172-A1
SSD storage type TLC
PCI Express (PCIe) version 4
Controller channels 4
Terabytes Written (TBW) 300
warranty period 5 years
Has an integrated heatsink ✕
maximum operating temperature 85 °C
bits of encryption supported 0
has RGB lighting ✕

The WD Black SN7100 500GB is an M.2 NVMe SSD running on PCIe 4.0 with NVMe version 1.4, offering 500GB of internal storage built on TLC NAND. It is driven by the Polaris 3 A101-000172-A1 controller operating across four channels, and uses Host Memory Buffer caching in place of dedicated onboard DRAM. Endurance is rated at 300 TBW, and the drive is backed by a five-year warranty. It operates at temperatures up to 85 °C and does not include an integrated heatsink, RGB lighting, or hardware AES encryption support.

Final Verdict

The Western Digital WD Black SN7100 500GB is a focused, no-frills M.2 NVMe drive that delivers on the fundamentals: strong sequential throughput, notably high random write IOPS, and a five-year warranty that reflects confidence in its long-term durability. Its PCIe 4.0 interface paired with the four-channel Polaris 3 controller makes it a capable option for users who need reliable, high-bandwidth storage in a modern system without the added bulk of a heatsink or the overhead of RGB. The absence of hardware encryption and the reliance on Host Memory Buffer caching are real constraints that narrow its appeal in security-sensitive or continuously saturated workload environments, but for mainstream desktop and laptop use cases centered on speed and endurance, the SN7100 500GB presents a technically coherent and well-rounded storage solution.

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