Seagate
Seagate Constellation.2 HDD-ST91000640SS 1TB 7200 RPM 64MB SAS 6Gb/s 2.5" laptop hard drive
A 2.5-inch 1TB enterprise drive with 7200 RPM, 64MB cache, SAS 6Gb/s interface and 1.4M-hour MTBF for dense data-centre storage
- PackagingRetail
- InterfaceSAS 6Gb/s
- Capacity1TB
- Cache64MB
- Average Latency4.16ms
- RPM7200 RPM
- Enterprise capacity in a 2.5" form factor fits dense data centres
- 7200 RPM and 64 MB cache deliver fast data access
- SAS 6Gb/s interface ensures scalable, high-integrity connectivity
- 4M-hour MTBF and 0.62% AFR provide 24×7 reliability
- Average 6.4 W operation cuts power use by up to 41%
1TB SAS 2.5" enterprise drive
The Seagate Constellation.2 HDD-ST91000640SS is a 1TB 2.5-inch internal hard drive built for dense data-centre environments. It spins at 7200 RPM with a 64MB cache and connects through a SAS 6Gb/s interface. The format lets operators store twice as much data in the same footprint as earlier 2.5-inch models.
SAS 6Gb/s interface and cache
The 6Gb/s SAS link provides dual-port connectivity with improved data integrity and scalability for multi-drive arrays. A 64MB cache buffers bursts of read and write traffic to smooth latency under heavy concurrent workloads. Enhanced PowerChoice technology cuts idle power by up to 54% compared with standard operation.
Power and vibration limits
Average power draw stays below 6.4W, which is up to 41% less than typical 3.5-inch nearline drives. Rotational vibration tolerance is rated for high spindle-density chassis, though performance will vary if the enclosure lacks adequate airflow. The 4.16ms average latency and 1.4M-hour MTBF reflect sustained 24×7 operation rather than peak throughput.
Highlights
- Enterprise capacity in a 2.5" form factor fits dense data centres
- 7200 RPM and 64 MB cache deliver fast data access
- SAS 6Gb/s interface ensures scalable, high-integrity connectivity
- 4M-hour MTBF and 0.62% AFR provide 24×7 reliability
- Average 6.4 W operation cuts power use by up to 41%
Specifications
| Brand | Seagate |
|---|---|
| Series | Constellation.2 |
| Model | HDD-ST91000640SS |
| Packaging | Retail |
| Interface | SAS 6Gb/s |
| Capacity | 1TB |
| Cache | 64MB |
| Average Latency | 4.16ms |
| RPM | 7200 RPM |
| Features | Industry’s first 2.5-inch 1TB capacity-optimized drive for dense, space-constrained data centers allows you to store twice as much data in the same footprint. Build highly efficient bulk storage solutions while lowering your power consumption costs Designed for robust 24x7 operation with a 1.4M hour mean-time-between-failure (MTBF) rating Best-in-class rotational vibration tolerance ensures unrivaled performance in high spindle-density applications, and multi-drive firmware maximizes system availability Choose from 6Gb/s SAS with improved data integrity, scalability and fastest data |
| Form Factor | 2.5" |
| Shipping weight | 0.20 kg |
| Package size | 152 × 95 × 25 mm |
Questions about this item
What is the MTBF rating and annualized failure rate for the Constellation.2 ST91000640SS?
The drive has a mean-time-between-failures rating of 1.4M hours and an annualized failure rate of 0.62%, designed for 24×7 nearline operation.
What is the maximum sustained power draw for the ST91000640SS under heavy workload?
The Constellation.2 operates at fewer than 6.4W on average, the lowest operating power in its class for a 7200-RPM enterprise drive.
How much heat and noise does the 2.5-inch SAS drive produce when running continuously in a server?
Workload Management technology helps systems keep drives cool, while enhanced PowerChoice technology saves up to 54% energy during idle or slow periods.
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