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Rectangular silver 2.5 inch SAS hard drive with label showing model ST91000640SS

Seagate

Seagate ST91000640SS 1TB 7200RPM SAS 2.5in internal hard drive

SKU CH-AEQB-NXJX5

A 1 TB 2.5 in SAS drive spinning at 7200 RPM with 64 MB cache, rated for 1.4 M hours MTBF and 24×7 operation

  • 1TB capacity for high-density storage
  • 7200RPM spindle speed for responsive data access
  • SAS 6Gb/s interface for enterprise connectivity
  • 64MB cache buffer for improved throughput
  • 4M hours MTBF for 24×7 reliability

Enterprise Nearline Drive

The Seagate Constellation.2 ST91000640SS is a 1TB 2.5-inch SAS hard drive spinning at 7200RPM with a 64MB buffer. It is supplied as a lot of 10 new units rated at 1.4M hours MTBF for 24×7 operation. The 6Gb/s interface supports high-density deployments reaching 76TB per square foot.

Suited For Dense Arrays

This drive suits builders populating 2.5-inch SAS bays in storage servers or JBOD enclosures where nearline reliability and power efficiency matter. It is not for systems that only accept 3.5-inch drive carriers or lack a SAS backplane and controller.

Deciding Specification

The 2.5-inch SAS 6Gb/s form factor is the single specification that determines compatibility; the drive will only function in bays and controllers designed for that exact interface and physical size.

Highlights

  • 1TB capacity for high-density storage
  • 7200RPM spindle speed for responsive data access
  • SAS 6Gb/s interface for enterprise connectivity
  • 64MB cache buffer for improved throughput
  • 4M hours MTBF for 24×7 reliability

Specifications

No published specifications for this item yet.

Questions about this item

Will the 2.5 inch SAS drive fit a standard 2.5 inch drive bay?

Yes, the 2.5 inch form factor matches standard 2.5 inch drive bays and the SAS 6Gb/s interface uses the same physical connector as other 2.5 inch SAS drives.

What is the correct way to connect the SAS data and power cables during installation?

Attach the SAS data cable to the controller port first, then connect the combined SAS power connector; reversing the order can prevent the drive from spinning up.

How often should I monitor the drive health given the 1.4M hour MTBF rating?

Schedule SMART checks monthly and plan for replacement after five years of 24×7 operation, as the MTBF is a statistical average not a guaranteed lifespan.

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