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Silver 2.5 inch SAS enterprise hard drive bare drive 15mm thick

Seagate

Seagate ST91000641SS 1TB 7200 RPM 64MB SAS 6Gb/s 2.5" internal hard drive

SKU CH-3THN-P1P76 MPN ST91000641SS

A 1TB 2.5" enterprise drive with SAS interface, 7200 RPM and 64MB cache for high-density storage

  • Total capacity1 TB
  • Interface typeSAS 6Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory64 MB
  • Rotational speed7,200 RPM
  • Enterprise density reaches 76TB per square foot
  • 4M hour MTBF supports nearline reliability
  • SAS 6Gb/s interface with 7200 RPM speed
  • 64MB cache accelerates data throughput
  • 5 inch form factor fits dense enclosures

Enterprise Storage Density

This 2.5-inch SAS hard drive delivers 1TB capacity at 7200 RPM with a 64MB cache. It belongs to the Seagate Constellation.2 series and includes hardware-based encryption. The bare-drive unit is built for environments that prioritise footprint efficiency.

SAS 6Gb/s Interface Limits

The SAS 6Gb/s interface caps the maximum theoretical throughput at six gigabits per second. Real-world sustained transfer rates will be lower and depend on the host controller and workload. The 15mm z-height also restricts use to bays or enclosures that accept thicker 2.5-inch drives.

Pre-Installation Checks

Verify that your server or storage array provides a SAS backplane or controller with a compatible connector. Confirm the chassis accepts 15mm-high 2.5-inch drives and supplies adequate cooling for enterprise duty cycles. Ensure your RAID or HBA firmware supports drives with hardware encryption.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $209.99
Pricier than about 71% of the 4,938 comparable items (median $107.99).
Total capacity 1 TB
Lower than about 60% of the 2,372 comparable items (median 2 TB).
Price per TB $209.99 per TB
Pricier than about 80% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineConstellation.2
Model nameST91000641SS
Total capacity1 TB
Performance
Rotational speed7,200 RPM
Storage
Cache memory64 MB
Ports & slots
Interface typeSAS 6Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.91 kg
Package size178 × 127 × 51 mm

Questions about this item

Should I pick the 1TB capacity or a different size for this Constellation.2 drive?

This model is offered as a 1TB unit with 7200 RPM and 64MB cache; other capacities are separate part numbers.

What does the 7200 RPM speed deliver in an actual server?

The 7200 RPM spindle provides consistent nearline throughput for mixed read and write workloads in 2.5-inch bays.

How does the SAS 6Gb/s interface limit real-world transfer rates?

The SAS 6Gb/s link caps the drive's external transfer rate at 6Gb/s, which the 7200 RPM mechanics and 64MB cache operate within.

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