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The Seagate ST91000640SS Constellation.2 drive provides enterprise‑class performance, high reliability, and a compact form factor with 1TB of storage capacity. With its SAS 6Gb/s interface, 10,000 RPM class performance, and 64MB cache, it is engineered for mission‑critical environments requiring 24x7 availability and long‑term durability in dense data center deployments.
As part of the Seagate Constellation series, this HDD combines low power consumption with advanced enterprise features such as rotational vibration sensors, enhanced error recovery, and data security options. Its 2.5-inch size allows higher rack density compared to standard 3.5-inch drives, ideal for servers and storage arrays where space and efficiency are critical.
The Constellation ST91000640SS is designed for enterprise storage environments with up to 24x7 workload demands. Its SAS interface ensures robust connectivity and full‑duplex data transfer. Optimized for reliability, it includes error recovery control for RAID environments and is built to sustain heavy transactional and sequential workloads.
This drive offers advanced caching technology for improved performance, enterprise vibration tolerance, and optional Seagate Secure self‑encrypting drive (SED) models. Built for scalable enterprise storage, its lower power draw per terabyte makes it a cost‑effective, eco‑friendly solution without compromising throughput or reliability.
The Seagate ST91000640SS Constellation.2 is engineered for absolute reliability in enterprise systems. With MTBF reaching 1.6 million hours, a workload rating of up to 550TB/year, and resilience in multi‑drive environments, it ensures dependable performance. Optimized for dense racks and blade servers, this drive delivers low latency, consistent throughput, and energy‑efficient operation.
| Specification | Details |
|---|---|
| Part Number | ST91000640SS |
| Brand | Seagate |
| Series | Constellation.2 |
| Product Type | Enterprise Hard Disk Drive |
| Capacity | 1 TB |
| Interface | SAS 6Gb/s |
| Form Factor | 2.5-inch |
| Spindle Speed | 7200 RPM / 10K class performance |
| Cache | 64 MB |
| Sector Format | 512n |
| Workload Rating | Up to 550 TB/year |
| MTBF | 1.6 million hours |
| 24x7 Operation | Yes (enterprise duty) |
| Average Latency | 4.16 ms |
| Max Sustained Transfer Rate | Up to ~145 MB/s |
| Power Consumption (Idle) | ~3.8 W |
| Power Consumption (Operating) | ~5.8 W |
| Vibration Protection | Rotational Vibration (RV) sensors |
| Security Options | Models available with Seagate Secure (SED/FIPS) |
| Compatibility | Enterprise servers, blade servers, storage arrays |

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