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Silver rectangular 3.5 inch hard drive with circuit board visible

Seagate

Seagate IronWolf Pro ST20000NT001 20TB 7200 RPM 256MB SATA 3.5" internal hard drive

SKU CH-Q2W9-YGJPQ MPN ST20000NT001

20 TB 3.5" SATA drive at 7200 RPM with 256 MB cache, built for 24/7 multi-bay NAS workloads

  • Total capacity20 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory256 MB

Capacity 20TB

  • 20TB capacity stores massive datasets in one drive
  • 7200 RPM spindle speed accelerates read and write throughput
  • 256MB cache buffers bursts for smoother multi-user access
  • CMR recording technology ensures consistent performance under heavy RAID workloads
  • AgileArray firmware balances dual-plane operation and limits error recovery for multi-bay stability

20 TB NAS drive for multi-bay RAID

The Seagate IronWolf Pro ST20000NT001 is a 20 TB hard drive built for 24/7 operation in multi-bay NAS enclosures. It uses CMR recording technology and a 7200 RPM spindle speed to sustain heavy workloads. The SATA 6.0 Gb/s interface connects directly to standard NAS controllers. It targets commercial and enterprise environments that require continuous data availability.

AgileArray firmware for vibration and error handling

AgileArray firmware applies dual-plane balancing and time-limited error recovery to maintain RAID stability across multiple drive bays. The 256 MB cache absorbs burst write traffic during peak multi-user access. The drive is rated for always-on duty cycles in enterprise NAS deployments. Mechanical dimensions are 26.11 mm height, 101.85 mm width and 146.99 mm length.

IronWolf Health Management and Rescue Data Recovery

IronWolf Health Management software monitors drive health parameters and provides proactive alerts plus recovery recommendations. The package includes three years of Rescue Data Recovery Services to offset costs if physical damage or corruption occurs. Retail or OEM packaging may vary depending on supply. No additional cables or mounting hardware are bundled.

How it compares

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

Price $552.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 20 TB
Higher than about 94% of the 2,372 comparable items (median 2 TB).
Price per TB $27.65 per TB
Cheaper than about 86% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineIronWolf Pro
Model nameST20000NT001
Part numberST20000NT001
Total capacity20 TB
Recommended useEnterprise NAS Hard Drives
Performance
Rotational speed7,200 RPM
Storage
Recording methodCMR
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.11 mm
Maximum width101.85 mm
Maximum length146.99 mm
Shipping weight0.91 kg
Package size196 × 152 × 51 mm

Other versions of this model

5 more in the same range

Questions about this item

How do I install the ST20000NT001 in a multi-bay NAS and what step do people often miss?

Mount the 3.5" drive using the 101.85 mm width and 146.99 mm length screw points, connect the SATA 6.0Gb/s data and power cables, then enable the AgileArray dual-plane balancing and time-limited error recovery (TLER) in the NAS RAID controller so the drive handles multi-bay vibration correctly.

What maintenance or replacement will the IronWolf Pro need later?

The drive includes three years of Rescue Data Recovery Services for accidental corruption or physical damage; after that period you must arrange your own recovery plan, and the IronWolf Health Management system will continue to provide proactive alerts so you can replace the unit before a predicted failure.

What limit appears first under sustained 24x7 workloads?

The 26.11 mm height restricts airflow in dense chassis, so thermal throttling can engage before the 7200 RPM platters or 256 MB cache saturate, especially when all bays run 24/7 at the full 20 TB capacity.

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