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Silver 3.5 inch internal hard drive with SATA connectors and label showing IronWolf Pro 4TB

Seagate

Seagate IronWolf Pro ST4000NT001 4TB 7200 RPM 256MB SATA 3.5" internal hard drive

SKU CH-W9PX-N8BZM MPN ST4000NT001

A 4 TB 7200 RPM SATA drive with 256 MB cache built for 24×7 NAS RAID arrays

  • Total capacity4 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory256 MB

Capacity 4TB

  • Built for 24x7 multi-bay NAS workloads
  • 7200 RPM and 256 MB cache deliver fast RAID throughput
  • CMR recording technology ensures consistent write performance
  • AgileArray dual-plane balancing and TLER optimise RAID reliability
  • IronWolf Health Management plus three-year Rescue Data Recovery protects data

Built for Multi-Bay NAS

The Seagate IronWolf Pro ST4000NT001 is a 4TB 3.5-inch internal hard drive designed for commercial and enterprise NAS systems. It spins at 7200 RPM with a 256MB cache and uses CMR recording technology. The SATA 6.0Gb/s interface connects directly to standard drive bays. AgileArray firmware adds dual-plane balancing and time-limited error recovery for consistent RAID performance in multi-bay enclosures. This drive is built for 24x7 operation in always-on environments.

Suits RAID Arrays Not Single Desktop PCs

This drive targets administrators running multi-user, multi-bay NAS appliances that demand sustained throughput and RAID optimisation. The firmware and vibration tuning are calibrated for dense chassis, not standalone workstations. Buyers who need a quiet, low-power drive for a single-bay home PC or external enclosure should look elsewhere. The enterprise feature set adds cost and acoustic output that a typical desktop workload does not justify.

Four Terabytes With 256MB Cache Headroom

The 4TB capacity handles growing media libraries, virtualisation datastores and backup repositories across multiple bays. The 256MB cache absorbs bursty write streams common in RAID rebuilds and concurrent user access. In heavy sustained write scenarios the 7200 RPM platters eventually become the bottleneck, limiting peak throughput compared to solid-state alternatives. For workloads exceeding this capacity or speed tier, a higher-capacity IronWolf Pro model or SSD tier is required.

How it compares

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

Price $172.99
Pricier than about 64% of the 4,938 comparable items (median $107.99).
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $43.25 per TB
Cheaper than about 67% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineIronWolf Pro
Model nameST4000NT001
Part numberST4000NT001
Total capacity4 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

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Questions about this item

Does this SATA 6.0Gb/s IronWolf Pro require a specific RAID controller or motherboard port to function in a NAS?

It connects via a standard SATA 6.0Gb/s interface and works with any compatible NAS bay or motherboard SATA port that supports 3.5" drives.

Will the 7200 RPM speed and 256MB cache of this drive cause issues when mixed with slower drives in the same array?

The drive operates at its rated 7200 RPM with 256MB cache; array performance will follow the slowest drive, but AgileArray TLER helps maintain RAID stability in mixed configurations.

How can I verify the IronWolf Health Management system is actively monitoring this drive after installation?

Use the NAS vendor's built-in S.M.A.R.T. tools or IronWolf Health Management compatible software to view real-time health metrics and prevention alerts.

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