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Silver 2.5 inch 15mm enterprise hard drive bare unit

Seagate

Seagate Constellation.2 ST91000640NS 1TB 7200 RPM 64MB SATA 6.0Gb/s 2.5" 15mm internal hard drive

SKU CH-VRPX-KQ7KZ MPN ST91000640NS

A 2.5-inch enterprise hard drive with 1TB capacity, 7200 RPM speed and 64MB cache for space-constrained servers

  • Total capacity1 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory64 MB
  • Mean latency4.16 ms
  • 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.

How it compares

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

Price $220.99
Pricier than about 72% 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 $220.99 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 nameST91000640NS
Total capacity1 TB
Recommended useIdeal for Servers
Performance
Mean latency4.16 ms
Rotational speed7,200 RPM
Storage
Cache memory64 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Max height15 mm
Maximum width70.1 mm
Maximum length100.45 mm
Shipping weight0.21 kg
Package size131 × 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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