SSD disk Western Digital 3.84 TB U.2 PCI Express 5.0 NVMe Ultrastar DC SN861

The Western Digital Ultrastar DC SN861 3.84 TB U.2 PCIe 5.0 NVMe SSD is a high-performance enterprise drive designed for servers, hyperscale and cloud data centers, and compute-intensive applications. It delivers PCIe Gen5 read/write throughput, low latency and optimized power efficiency in a U.2 form factor to support demanding AI, machine learning and mixed workload environments.

Advantages

The DC SN861 provides high random read performance and strong sustained write capability with PCIe 5.0 bandwidth, balanced with power-efficient design to maximize IOPs per watt. It includes enterprise features such as Power Loss Protection, End-to-End Data Path Protection and TCG security/encryption, plus support for NVMe 2.02, NVMe MI 1.2c, Flexible Data Placement and OCP 2.0. The drive is available in multiple capacities and carries a limited 5-year warranty.

Suitable for

• AI training and inference servers
• Machine learning workloads
• Hyperscale and cloud data center storage
• Enterprise databases and virtualisation
• Mixed read/write intensive applications

Key specifications

• Form factor: U.2
• Capacity: 3.84 TB (3840 GB)
• Interface: PCI Express 5.0, NVMe
• Max sequential read speed: up to 13,700 MB/s
• Max sequential write speed: up to 7,200 MB/s
• Standards: NVMe 2.02, NVMe MI 1.2c, OCP 2.0 support
• Endurance options: 1 and 3 DWPD (as supported by model family)
• Warranty: 5-year limited warranty

How to use

Install the Ultrastar DC SN861 into a compatible U.2 drive bay or adapter on a PCIe Gen5-capable server or workstation. Ensure the system BIOS/firmware and NVMe drivers support PCIe 5.0 and NVMe 2.02 for full functionality. Configure the drive within the operating system or storage controller, initialise and format as required by your workload, and apply any vendor-recommended firmware or security configurations (for example TCG encryption) before use.

Recommendations

For best results in AI and mixed workloads, pair the DC SN861 with PCIe Gen5 platforms, maintain up-to-date firmware, and monitor drive health and endurance. Use appropriate cooling and power-loss protection measures in server environments to preserve performance and data integrity.