Western Digital Ultrastar DC SN640 NVMe SSD (0TS1928): This is a U.2 2.5-inch enterprise NVMe solid-state drive with 1.92TB capacity operating over a PCIe Gen3 x4 interface. It is a data center SSD designed for read-intensive and mixed workloads, not a consumer SSD and not a SATA drive.
Engineering Context
The Ultrastar DC SN640 occupies the read-intensive to mixed-use segment of Western Digital's enterprise SSD lineup. The PCIe Gen3 x4 NVMe interface provides significantly higher throughput and lower latency than SATA SSDs. The U.2 (SFF-8639) form factor enables hot-swap capability in enterprise server drive bays. At 1.92TB, this capacity point is standard for boot drives, VM storage, read caches, and moderate-write database workloads. The drive supports power-loss protection and end-to-end data path protection with T10 DIF for enterprise data integrity.
Deployment & Use Cases
Server Boot / OS Drives: Fast, reliable boot storage for enterprise servers.
Read-Intensive Workloads: Content delivery, web serving, data analytics where read IOPS dominate.
Virtualization Storage: VM datastores requiring consistent low-latency NVMe performance.
Database Caching: Read caches for database systems (MySQL, PostgreSQL, MongoDB).
Technical Specifications
OEM: Western Digital
Model: Ultrastar DC SN640
Part Number: 0TS1928
Capacity: 1.92TB
Interface: PCIe Gen3 x4 NVMe
Form Factor: U.2 2.5-inch (SFF-8639)
Endurance Class: Read-Intensive / Mixed-Use
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
NVMe Only: Requires a U.2 NVMe-capable drive bay or PCIe adapter. Does not work in SATA-only drive bays.
PCIe Gen3: Will function in PCIe Gen4 slots at Gen3 speeds. Will not operate in SATA or SAS backplanes.
U.2 Connector: Uses SFF-8639 U.2 connector. Requires U.2 cabling or a backplane with U.2 support. Does not use M.2 or standard PCIe slot without an adapter.
Refurbished: Drive health and remaining endurance should be verified using NVMe SMART data after installation.