Seagate
Seagate Cheetah NS ST3400755SSProduct 400 GB 3.5" SAS internal hard drive
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$23.99
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Seagate
Seagate Constellation.2 ST91000640NS 1TB 7200 RPM 64MB SATA 6.0Gb/s 2.5" 15mm internal hard drive
A 2.5-inch enterprise hard drive with 1TB capacity, 7200 RPM speed and 64MB cache for space-constrained servers
- PackagingBare Drive
- InterfaceSATA 6.0Gb/s
- Capacity1TB
- Cache64MB
- Average Latency4.16ms
- RPM7200 RPM
- Enterprise storage density up to 76TB per square foot
- High reliability with 1.4M hours MTBF rating
- 7200 RPM speed backed by 64MB cache buffer
- Energy-efficient 2.5-inch form factor fits 15mm bays
- SATA 6.0Gb/s interface enables fast data transfers
2.5" 15mm Enterprise Drive
The Seagate Constellation.2 ST91000640NS is a 1 TB, 7200 RPM hard drive with a 64 MB cache and a SATA 6.0Gb/s interface. It uses a 2.5-inch, 15 mm z-height form factor designed for enterprise-class nearline storage in space-constrained data centres. The bare drive delivers an average latency of 4.16 ms and a 1.4M hour MTBF rating.
Suits high-density server racks, not laptops
This drive suits administrators populating dense server or storage arrays that accept 15 mm 2.5-inch bays and benefit from the 76 TB per square foot footprint. Builders assembling laptops, compact enclosures or any system limited to thinner drives cannot use this model because the 15 mm height exceeds those chassis allowances.
SATA 6.0Gb/s interface decides compatibility
The single specification that determines fit is the SATA 6.0Gb/s interface combined with the 15 mm physical height; the host must provide a compatible SATA port and a drive bay that accommodates the 15 mm z-height.
Highlights
- Enterprise storage density up to 76TB per square foot
- High reliability with 1.4M hours MTBF rating
- 7200 RPM speed backed by 64MB cache buffer
- Energy-efficient 2.5-inch form factor fits 15mm bays
- SATA 6.0Gb/s interface enables fast data transfers
Specifications
| Brand | Seagate |
|---|---|
| Series | Constellation.2 |
| Model | ST91000640NS |
| Packaging | Bare Drive |
| Interface | SATA 6.0Gb/s |
| Capacity | 1TB |
| Cache | 64MB |
| Average Latency | 4.16ms |
| RPM | 7200 RPM |
| Features | Second generation of the first 2.5-inch, mainstream capacity, 15mm z-height, enterprise-class nearline drive for space-constrained data centers 2.5-inch enterprise-class hard drive Energy efficient storage at under 3.31 watts (idle) Highest nearline reliability with an MTBF of 1.4M hours |
| Usage | Ideal for Servers |
| Form Factor | 2.5" |
| Height (maximum) | 15mm |
| Width (maximum) | 70.1mm |
| Length (maximum) | 100.45mm |
| Shipping weight | 0.21 kg |
| Package size | 131 × 84 × 23 mm |
Questions about this item
Does the bare ST91000640NS come with screws or a caddy, or must they be purchased separately?
The drive is supplied as a bare unit without mounting screws, cables or a caddy; those items need to be sourced separately.
Should I choose the 1 TB 7200 RPM model or a different capacity in the Constellation.2 range?
This 1 TB version delivers the highest capacity available in the series while keeping the 7200 RPM spindle and 64 MB cache for consistent nearline performance.
What does the 1.4 million-hour MTBF figure mean for a server running this 2.5-inch 15 mm drive?
It represents the highest nearline reliability rating in the line, indicating the drive is designed for continuous operation in space-constrained data centres.
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