WD Ultrastar DC SN655 3.84 TB NVMe SSD — PCIe 4.0 Enterprise Performance

Data strategy, not just data storage. The WD Ultrastar DC SN655 is built for cloud-scale servers and data-center deployments that demand high capacity, steady read-heavy performance, and cost-optimized efficiency. This 3.84 TB NVMe SSD delivers enterprise-grade reliability, low latency, and sustained throughput to accelerate data-intensive workloads like database caching, analytics, virtualization, and content delivery. With a U.3 internal form factor and PCIe 4.0 connectivity, the SN655 unlocks the full potential of modern server architectures, helping IT teams scale capacity without sacrificing performance or reliability.

• High-capacity, read-optimized NVMe SSD: 3.84 TB of fast storage designed to support read-intensive workloads and caching layers in large-scale environments.
• PCIe 4.0 NVMe performance: Delivers optimized throughput and low latency to accelerate data access for demanding applications and multi-tenant workloads.
• Enterprise-grade reliability: Built to run 24/7 in data centers with robust data protection features, error correction, and long-term firmware support.
• Dense, enterprise-friendly form factor: U.3 internal drive with a 15 mm height enables dense rack installations and straightforward integration into existing storage arrays.
• Efficient thermal and power design: Engineered for sustained performance in hot data-center environments while managing power consumption effectively.

Technical Details of WD Ultrastar DC SN655

• Capacity: 3.84 TB
• Form Factor / Interface: U.3 internal drive, 15 mm height; PCIe Gen4 x4 NVMe
• NVMe Protocol: NVMe over PCIe for low latency and high IOPS
• Workload Focus: Read-intensive and data-caching workloads optimized for cloud and server environments
• Reliability & Protection: Enterprise-grade reliability with data-protection features and robust error handling
• Thermal Design: Designed for sustained performance in dense data-center racks with efficient cooling characteristics

How to Install WD Ultrastar DC SN655

Installing the WD Ultrastar DC SN655 is straightforward in compatible servers and storage enclosures. Follow these best-practice steps to ensure a smooth deployment and optimal performance:

• Power down the host server and unplug it from power to prevent any electrical hazards during installation.
• Verify that the server chassis and storage controller support U.3 NVMe drives and PCIe 4.0 interfaces. Confirm compatibility with the SN655 model and firmware requirements.
• Open the drive cage or tray, then insert the SN655 into a compatible U.3 slot until it seats firmly. Secure with the appropriate screws or latches as dictated by the enclosure.
• Reconnect any necessary cables or backplane connections, then close the chassis. Power on the server and enter the storage or BIOS/RAID controller utility to recognize the new drive.
• Update to the latest firmware for the SN655 if available, and initialize the drive according to your storage policy (e.g., formatting, partitioning, and RAID or non-RAID configuration).
• Run a quick health check (SMART or vendor-provided diagnostics) to verify status, and add the drive to your data pool or storage array as needed.

Frequently Asked Questions

• Q: What workloads is the WD Ultrastar DC SN655 best suited for?
• A: It is ideal for read-intensive applications, caching layers, analytics pipelines, databases, virtualization caches, and cloud/server workloads where capacity and predictable performance are critical.
• Q: What interface and form factor does this drive use?
• A: It uses a U.3 internal 15 mm drive form factor with PCIe Gen4 x4 NVMe, designed for enterprise storage environments.
• Q: How much capacity does the SN655 offer?
• A: The drive offers 3.84 TB of NVMe storage, suitable for dense server deployments and large-scale data centers.
• Q: Is this drive suitable for hot-swappable configurations?
• A: In properly configured data-center chassis and with compatible backplanes, SN655 drives can be hot-swapped. Refer to your enclosure and controller documentation for supported capabilities.
• Q: How should I optimize performance and reliability after installation?
• A: Keep firmware up to date, monitor drive health and temperature, configure appropriate data protection features, and align usage with your data-center storage policies to maximize longevity and performance.