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Western Digital WD Black SN7100 4TB specifications and in-depth review

Western Digital WD Black SN7100 4TB

Manufacturer: Western Digital

The Western Digital WD Black SN7100 4TB is a high-performance M.2 NVMe SSD built for demanding workloads. With a sequential read speed of 7250 MB/s and a capacity of 4000GB, this drive provides fast and reliable storage for gaming, content creation, and professional applications.

This SSD features HMB (Host Memory Buffer) for enhanced performance and uses TLC NAND flash for efficient storage. It operates with the Polaris 3 A101-000172-A1 controller, supports PCIe 4.0, and offers up to 2400 TBW. Its maximum operating temperature is 85°C, and it comes with a 5-year warranty, though it does not include a heatsink or RGB lighting.

Pros
  • Offers 7250 MB/s sequential read speed, ensuring fast data transfers for high-performance tasks.
  • Supports PCIe 4.0, providing enhanced bandwidth for faster data throughput.
  • Includes HMB (Host Memory Buffer) for improved performance in data-intensive applications.
  • Has a high 2400 TBW (Terabytes Written) rating, offering strong endurance for heavy usage over time.
  • Comes with a 5-year warranty, providing long-term reliability and peace of mind.
Cons
  • Lacks an integrated heatsink, which may affect thermal management during extended high-load operations.
  • Does not feature AES encryption, limiting security options for sensitive data.
  • Does not have RGB lighting, which may be a drawback for users looking for aesthetic customization.
Who is this for?

The Western Digital WD Black SN7100 4TB is ideal for users who require high-speed storage for demanding tasks like gaming, content creation, or professional applications. With its 7250 MB/s sequential read speed and 2400 TBW endurance, it is well-suited for those who need fast data transfers and long-term reliability under heavy workloads. Its PCIe 4.0 support further ensures optimal performance in environments that require high bandwidth.

Who is this NOT for?

This SSD may not be suitable for users looking for a secure storage solution, as it lacks AES encryption support, which is important for protecting sensitive data. Additionally, its lack of an integrated heatsink means that users running applications that generate significant heat over extended periods may experience thermal throttling or performance degradation.

Read speed:

sequential read speed 7250 MB/s
random read speed 900000 IOPS

The Western Digital WD Black SN7100 4TB offers impressive read speeds, with a sequential read speed of 7250 MB/s for fast data transfers. It also delivers strong random read performance, achieving 900,000 IOPS for efficient handling of random data access patterns, making it ideal for demanding applications and workloads.

Write speed:

sequential write speed 6900 MB/s
random write speed 1350000 IOPS

The Western Digital WD Black SN7100 4TB offers strong write performance with a sequential write speed of 6900 MB/s, ensuring fast data storage and retrieval. Additionally, it excels in random write tasks, achieving 1,350,000 IOPS, making it highly efficient for workloads involving unpredictable or mixed write operations.

Benchmarks:

General info:

type M2
SSD cache HMB (Host Memory Buffer)
Is an NVMe SSD ✓
NVMe version 1.4
internal storage 4000GB
release date March 2025
controller Polaris 3 A101-000172-A1
SSD storage type TLC
PCI Express (PCIe) version 4
Controller channels 4
Terabytes Written (TBW) 2400
warranty period 5 years
Has an integrated heatsink ✕
maximum operating temperature 85 °C
bits of encryption supported 0
has RGB lighting ✕

The Western Digital WD Black SN7100 4TB is an NVMe M.2 SSD that offers 4000GB of internal storage, making it suitable for large-scale data applications. It is powered by the Polaris 3 A101-000172-A1 controller and utilizes TLC NAND flash for efficient storage. This drive supports PCIe 4.0 and operates with 4 controller channels, ensuring fast data throughput. With a 5-year warranty and a maximum operating temperature of 85°C, it is built for reliability and performance.

Final Verdict

The Western Digital WD Black SN7100 4TB is a high-performance NVMe SSD designed for demanding workloads. With impressive 7250 MB/s sequential read speed and 2400 TBW endurance, it excels in scenarios that require fast data transfers and reliability. However, its lack of AES encryption and integrated heatsink may limit its appeal for users focused on security or thermal management. Overall, this SSD is a solid choice for high-end users seeking strong performance and long-term durability in data-intensive tasks.

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