WD Ultrastar DC SN655 7.68TB NVMe PCIe 4.0 U.3 Internal SSD

Data strategy, not just data storage. The WD Ultrastar DC SN655 is engineered for data-centered performance, delivering read-intensive capability at scale for cloud platforms, enterprise servers, and storage arrays. With an impressive 7.68 TB capacity and a PCIe Gen4 NVMe interface, this internal U.3 drive is built to accelerate data-heavy workloads while helping data centers manage density, reliability, and total cost of ownership. Designed for continuous operation in demanding environments, the SN655 combines enterprise-grade endurance with efficient power and thermal characteristics to keep performance steady under load. If your workloads rely on rapid data access, fast reads, and consistent throughput across large datasets, the SN655 provides the right blend of capacity, speed, and reliability to power modern data-intensive applications.

• Outstanding read-focused performance for data-intensive workloads — The SN655 is optimized for read-dominant I/O patterns common in analytics, database querying, big-data pipelines, content delivery networks, and streaming services. Leveraging PCIe 4.0 NVMe, this drive minimizes latency and delivers high sequential and random read throughput, enabling servers to feed compute nodes with data faster than ever. Its architecture also supports high queue depths and parallel processing, which translates into sustained IOPS under heavy concurrency. In cloud environments and enterprise data centers, this means faster report generation, quicker data retrieval for dashboards, and smoother real-time analytics, all while maintaining predictable latency across bursts of activity.
• High-capacity storage to consolidate data and simplify management — At 7.68 TB, this Ultrastar NVMe SSD consolidates vast datasets, large-scale logs, backups, and cold data into a single, compact drive. This density helps data centers reduce rack space, simplify cabling, and lower the overhead associated with managing dozens of smaller drives. By increasing usable capacity per bay, IT teams can maintain larger data lakes, retain longer data histories for analytics, and support archival workflows without sacrificing performance. The result is a more streamlined storage footprint with fewer devices to monitor and maintain, which can translate into lower total cost of ownership over the drive lifecycle.
• Enterprise-grade reliability and data integrity — Ultrastar drives are designed for the rigors of continuous operation in modern data centers. The SN655 emphasizes reliability with robust error correction, wear-leveling, and data integrity protections that help ensure consistent performance and protect against data loss during sustained workloads. For IT operations, this translates to more predictable behavior under heavy I/O, easier capacity planning, and improved resiliency in virtualized environments and cloud deployments. The drive’s construction and firmware are tuned for long, steady performance, reducing the likelihood of performance degradation over time and helping service levels remain stable as demand grows.
• Efficient cooling and energy-aware design — In data-center environments where cooling is a major cost driver, the SN655 is engineered to balance high performance with power efficiency. The drive’s internal architecture and firmware work together to minimize power draw during idle periods and maintain thermal stability under load. This enables data centers to sustain higher rack densities without oversizing cooling systems, contributing to lower operating expenses and more predictable thermal budgets. For organizations pursuing greener IT practices, the SN655 offers a practical path to improved energy efficiency without compromising read performance or capacity.
• Flexible deployment with a U.3 internal form factor — The SN655 uses a U.3 internal interface with a 15 mm drive height, enabling compatibility with a wide array of 2.5-inch enterprise servers and storage enclosures. This flexibility makes it easier to integrate into existing hardware without requiring major chassis redesigns. The internal design supports straightforward installation, hot-swap readiness in compatible systems, and easy replacement when maintenance is needed. With its 7.68 TB capacity and PCIe Gen4 speeds, the SN655 is a compelling upgrade for data centers seeking to modernize storage density and performance in a familiar form factor.

Technical Details of WD Ultrastar DC SN655

• Capacity: 7.68 TB
• Interface: PCIe NVMe 4.0 (Gen4) x4
• Form Factor: U.3 internal, 15 mm height
• Drive Type: Enterprise NVMe SSD
• Target Workload: Read-intensive data-center workloads, databases, analytics, and large-scale storage applications

How to install WD Ultrastar DC SN655

• Power down the server or storage array and disconnect power, then ground yourself to prevent static discharge.
• Identify an available U.3 NVMe slot in the chassis or drive cage that supports 2.5-inch enterprise SSDs with U.3 interface.
• Align the SN655 with the slot’s connector, ensuring the drive is oriented correctly and seated firmly in the bay.
• Secure the drive with the mounting screws or rails provided in your chassis, following your platform’s installation guidelines.
• Reconnect power and data connections, reseat the server if necessary, and power on. Enter the system BIOS/EFI to verify that the drive is recognized by the controller, then initialize the drive in your operating system or virtualization platform as required.
• In the OS or hypervisor, create a new volume or pool, format the drive with the appropriate filesystem, and configure any storage pools or RAID configurations according to your deployment needs.

Frequently asked questions

• Q: What is the WD Ultrastar DC SN655? A: It is an enterprise NVMe SSD designed for data centers, optimized for read-intensive workloads with high capacity and PCIe Gen4 performance, making it suitable for cloud, virtualization, and analytics environments.
• Q: What capacity does it offer? A: The SN655 provides 7.68 TB of storage in a single drive, delivering substantial density for data-intensive applications and large-scale storage solutions.
• Q: What interface and form factor does it use? A: It uses a PCIe NVMe 4.0 interface with a U.3 internal form factor and a 15 mm drive height, compatible with many enterprise servers and storage arrays that support U.3 NVMe drives.
• Q: Is it suitable for cloud providers and data-center servers? A: Yes. The SN655 is engineered for cloud and server environments requiring fast reads, low latency, high concurrency, and reliable performance at scale.
• Q: How do I install this drive? A: Install the drive in a compatible U.3 NVMe bay following your server’s hardware guidelines, verify BIOS/firmware recognition, and initialize the drive within your operating system or storage controller as needed.