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2.5 inch SAS hard drive in silver metal casing with attached hot-swap tray

DELL

DELL Constellation.2 ST91000640SS 1TB 7200 RPM 2.5" SAS internal hard drive

SKU CH-Q7QN-BM1YG MPN Constellation.2

A 1 TB 2.5-inch SAS drive spinning at 7200 RPM with 64 MB cache and a 6.0 GB/s interface, supplied with a hot-swap tray

  • Total capacity1 TB
  • Interface typeSAS
  • Form factor2.5 in (6.35 cm)
  • Rotational speed7,200 RPM
  • Cache memory64 MB
  • 1 TB capacity for server storage
  • 7200 RPM rotational speed for quick data access
  • 0 GB/s SAS interface for high-throughput transfers
  • 64 MB cache to accelerate read/write operations
  • 5-inch low-profile form factor with attached hot-swap tray

1 TB SAS drive for servers

This 1 TB SAS hard drive spins at 7200 RPM and uses a 6.0 GB/sec interface. It is built for server and storage units that require hot-plug capability. The drive ships with a hotswap tray attached for direct installation.

Suits arrays needing hot-plug SAS drives

Administrators expanding SAS-based arrays with 2.5 inch bays will find this drive compatible. Systems limited to SATA-only controllers cannot use this drive. Buyers who need larger capacities should look at other models.

6.0 GB/sec SAS interface

The drive connects through a 6.0 GB/sec SAS interface, which determines host-controller compatibility. Verify that your backplane or controller supports this speed before purchase.

How it compares

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

Price $43.99
Cheaper than about 83% 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 $43.99 per TB
Cheaper than about 66% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameDELL
Model nameST91000640SS
Total capacity1 TB
Performance
Rotational speed7,200 RPM
Storage
Cache memory64 MB
Ports & slots
Interface typeSAS
Size & build
Form factor2.5 in (6.35 cm)

Questions about this item

Should I choose the 1 TB capacity or a larger version of this Constellation.2 drive?

Only the 1 TB capacity is offered for the ST91000640SS model, so no larger version of this exact drive exists.

What does the 6.0 GB/sec transfer rate mean once the drive is installed in a server?

The 6.0 GB/sec SAS interface sets the maximum link speed; real-world throughput will be lower and depends on the controller and workload.

Is the SAS interface on this drive compatible with standard SATA controllers?

No, the ST91000640SS uses a native SAS interface and requires a SAS HBA or RAID controller; it will not work on a SATA-only port.

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