SSD disk Western Digital 61.4 TB U.3 PCI Express 4.0 Ultrastar DC SN655

The Western Digital Ultrastar DC SN655 SSD disk delivers a high-capacity NVMe storage solution in a U.3 2.5" form factor, offering 61.4 TB of usable capacity and PCIe 4.0 performance. Designed for cloud and server environments, this Ultrastar drive targets read-intensive, data-heavy applications and supports U.2 and U.3 backplanes with built-in enterprise features such as power loss protection, dual-port redundancy and end-to-end data protection.

Advantages

The Ultrastar DC SN655 combines a PCIe Generation 4.0 NVMe controller and Western Digital BiCS5 TLC 3D NAND to provide low latency and sustained throughput with peak read performance up to 4300 MB/s and write performance up to 3150 MB/s. It offers high IOPS (up to 1.1M), a projected 2.5M hours MTBF and enterprise-grade durability (1.0 DW/D) with a five-year limited warranty, enabling reliable operation at scale.

Suitable for

• Cloud storage and hyperscale server platforms
• Scale-out databases and big data analytics
• Machine learning training and AI inference workloads
• High-density storage arrays requiring U.3/U.2 compatibility

Key specifications

• Brand: Western Digital (Ultrastar DC SN655)
• Model / MPN: 0TS2510
• Capacity: 61.4 TB (61440 GB)
• Form factor: U.3 (2.5")
• Interface: PCIe 4.0 NVMe
• Sequential read speed: up to 4300 MB/s
• Sequential write speed: up to 3150 MB/s
• Peak IOPS: up to 1.1M
• Endurance: 1.0 DW/D (manufacturer spec)
• MTBF: 2.5M hours (projected)
• Weight: 0.1473 kg
• Warranty: 5-year limited

How to use

Install the SN655 into a compatible U.3 or U.2 backplane or adapter connected to a PCIe 4.0-capable host. Ensure the server firmware and operating system support NVMe drives and that any RAID or storage management controllers are configured to recognize U.3 devices. For best performance, place the drive in a slot with full PCIe Gen4 lanes and verify adequate cooling and power delivery are available.

Recommendations

Use the Ultrastar DC SN655 for read-intensive and mixed enterprise workloads where high capacity, consistent QoS and low latency are required. Maintain regular backups and monitor SMART/telemetry data to track health and endurance; follow server vendor guidelines for airflow and power to preserve performance and drive lifetime.