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Seagate Constellation.2 2.5 inch SAS enterprise hard drive bare drive 15mm silver metal casing

Seagate

Seagate ST91000642SS 1TB 7200 RPM 64MB SAS 2.5" internal hard drive

SKU CH-8HC7-5NEPM MPN ST91000642SS

A 2.5" SAS enterprise drive delivering 1TB at 7200 RPM with 64MB cache and FIPS 1402 encryption

  • 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 storage density up to 76TB per sq ft
  • Nearline reliability with 1.4M hours MTBF rating
  • SAS 6Gb/s interface with 7200 RPM performance
  • Hardware-based FIPS 140-2 encryption protects data
  • Compact 2.5 inch 15mm form factor saves space

Enterprise storage drive

The Seagate Constellation.2 ST91000642SS is a 1TB 2.5-inch internal hard drive built for enterprise servers and storage arrays. It spins at 7200 RPM with a 64MB cache and connects through a SAS 6Gb/s interface. The bare drive includes FIPS 140-2 validated encryption for data security.

Suited for high-density arrays

This drive fits 2.5-inch SAS bays that accept a 15mm z-height and works in systems designed for nearline workloads with a 1.4M hour MTBF rating. It is not for systems without a SAS host bus adapter or backplane, nor for installations limited to thinner drive profiles.

Deciding specification

The SAS 6Gb/s interface and 15mm form factor determine whether this drive can be installed and used. Buyers must confirm their chassis, controller and firmware support these exact physical and protocol requirements 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 $241.99
Pricier than about 75% 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 $241.99 per TB
Pricier than about 81% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineConstellation.2
Model nameST91000642SS
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 weight1.13 kg
Package size178 × 127 × 51 mm

Questions about this item

Will the 64MB cache or 7200 RPM spindle need service later?

The 64MB cache and 7200 RPM spindle are sealed inside the drive; no user maintenance is required for either component.

What limit appears first during sustained write workloads?

The SAS 6Gb/s interface caps sustained throughput before the 7200 RPM platters or 64MB cache become the bottleneck.

How much heat and noise does the 15mm 2.5" drive produce running all day?

The 15mm 2.5" form factor is built for dense enclosures; power draw and acoustics stay within enterprise nearline limits for continuous operation.

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