Internal U.3 SSD Western Digital Ultrastar DC SN655 15.36 TB (PCIe 4.0, NVMe 1.4b, 6800/3700 MB/s)

The Western Digital Ultrastar DC SN655 is a high-capacity enterprise SSD with 15.36 TB of usable storage in a U.3 form factor. Designed for server and workstation environments, it uses PCI Express 4.0 with NVMe 1.4b to deliver high sustained performance and reliability for demanding data workloads.

Advantages

The drive offers very fast sequential read speeds up to 6800 MB/s and write speeds up to 3700 MB/s, a robust mean time between failures (MTBF) rating of 2,500,000 hours, and a compact U.3 design that fits modern server storage bays. Its performance characteristics make it suitable for heavy I/O applications while maintaining enterprise-grade durability and power efficiency.

Suitable for

• Database servers and transaction processing
• Virtualization hosts and hyperconverged infrastructure
• High-performance workstations for data analysis
• Content delivery and caching systems

Key specifications

• Capacity: 15.36 TB
• Interface: PCI Express 4.0, NVMe 1.4b
• Form factor: U.3
• Maximum sequential read speed: up to 6800 MB/s
• Maximum sequential write speed: up to 3700 MB/s
• Mean time between failures (MTBF): 2,500,000 hours
• Operating temperature: 0 to 70 °C
• Weight: 147.3 g

How to use

Install the Ultrastar DC SN655 into a compatible U.3 drive bay or adapter that supports PCIe 4.0 NVMe. Ensure the server or workstation firmware and operating system NVMe drivers are up to date before initializing the drive. After installation, format and partition the SSD according to your operating system's storage management tools and integrate it into RAID arrays or storage pools if required by your deployment.

Recommendations

For optimal performance, use the drive in systems that provide PCIe 4.0 lanes and proper cooling. Monitor drive health with vendor utilities and schedule regular backups for critical datasets.