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Silver 3.5-inch bare enterprise hard drive with exposed circuit board

Seagate

Seagate ST1000NM0021 1TB 7200 RPM 64MB SAS 6Gb/s 3.5" internal hard drive

SKU CH-84Q4-D1XNB MPN ST1000NM0021

A 1 TB 3.5-inch enterprise drive with 7200 RPM, 64 MB cache, SAS 6Gb/s interface and 256-bit self-encryption for 24×7 operation

  • Total capacity1 TB
  • Interface typeSAS 6Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory64 MB
  • Enterprise-grade reliability for 24×7 workloads with 1.2 million hour MTBF
  • 6Gb/s SAS interface delivers consistent throughput with IOEDC and IOECC error correction
  • Self-Encrypting Drive option provides hardware-based 256-bit AES security
  • Low power consumption and PowerChoice technology reduce energy and cooling costs
  • 7200 RPM and 64MB cache ensure responsive performance for nearline storage

Enterprise nearline storage

The Seagate Constellation ES ST1000NM0021 is a 1TB 3.5-inch internal hard drive built for 24×7 operation in multi-drive servers and storage arrays. It spins at 7200 RPM with a 64MB cache and connects through a SAS 6Gb/s interface for enterprise workloads.

SAS installation and encryption

The bare drive fits standard 3.5-inch bays and connects with SAS data and power cables; no special mounting hardware is required. The Self-Encrypting Drive option uses 256-bit encryption, so the encryption key must be managed by the controller or host software to avoid data loss.

Suited for capacity-optimised servers

This drive suits administrators who need high-capacity, enterprise-class reliability with enhanced rotational vibration tolerance and an MTBF of 1.2 million hours. Buyers who want more storage per bay or require a SATA interface should consider other models.

How it compares

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

Price $152.99
Pricier than about 61% 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 $152.99 per TB
Pricier than about 72% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineConstellation ES
Model nameST1000NM0021
Total capacity1 TB
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Cache memory64 MB
Ports & slots
Interface typeSAS 6Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight1.00 kg
Package size178 × 137 × 38 mm

Questions about this item

How can I verify the ST1000NM0021 is running correctly after installation?

Check SMART attributes for reallocated sectors and confirm the drive reports 7200 RPM, 64 MB cache and a SAS 6Gb/s link speed in your RAID controller or HBA utility.

What comes with the bare drive and what must I source separately?

The box contains only the 3.5-inch drive; you need a SAS 6Gb/s cable, compatible backplane or HBA, mounting screws and a power connector.

Which capacity of the Constellation ES line should I pick for a 24×7 server array?

This model provides 1 TB; choose higher-capacity Constellation ES drives if you need more space per bay.

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