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Silver 3.5 inch SATA hard drive with green label

Seagate

Seagate IronWolf Pro ST12000NT001 12TB 7200 RPM 256MB SATA 3.5" internal hard drive

SKU CH-42GT-3DN6D MPN ST12000NT001

12 TB CMR drive spins at 7200 RPM with 256 MB cache for 24×7 NAS RAID arrays

  • InterfaceSATA 6.0Gb/s
  • Capacity12TB
  • Recording TechnologyCMR
  • RPM7200 RPM
  • Cache256MB
  • FeaturesOptimized for NAS with AgileArray AgileArray uses dual-plane

Options 12TB

  • 12 TB CMR capacity stores massive datasets
  • 7200 RPM and 256 MB cache accelerate RAID throughput
  • AgileArray dual-plane balancing optimises multi-bay NAS performance
  • IronWolf Health Management monitors drive health continuously
  • 95 % in-house data-recovery success rate with three-year Rescue service

12 TB NAS drive for multi-bay RAID

The Seagate IronWolf Pro ST12000NT001 is a 12 TB hard drive built for 24x7 operation in commercial and enterprise NAS. It uses conventional magnetic recording and a 7200 RPM spindle to deliver consistent throughput for multi-user workloads. The 3.5 inch form factor fits standard drive bays in rackmount or tower enclosures.

SATA 6.0 Gb/s interface ceiling

The drive connects over a SATA 6.0 Gb/s link, so sustained transfer rates cannot exceed that bus limit. In multi-bay arrays the shared backplane bandwidth becomes the practical bottleneck once several drives stream data simultaneously. AgileArray firmware adds dual-plane balancing and time-limited error recovery to keep RAID rebuilds stable under this constraint.

12 TB capacity with 256 MB cache

Twelve terabytes provides ample room for large media libraries, virtualisation datastores or backup repositories. The 256 MB cache absorbs burst write traffic and smooths random I/O in mixed read and write scenarios. Very large sequential jobs or heavy concurrent database workloads will eventually saturate the mechanical throughput headroom.

Highlights

  • 12 TB CMR capacity stores massive datasets
  • 7200 RPM and 256 MB cache accelerate RAID throughput
  • AgileArray dual-plane balancing optimises multi-bay NAS performance
  • IronWolf Health Management monitors drive health continuously
  • 95 % in-house data-recovery success rate with three-year Rescue service

Specifications

BrandSeagate
SeriesIronWolf Pro
ModelST12000NT001
InterfaceSATA 6.0Gb/s
Capacity12TB
Recording TechnologyCMR
RPM7200 RPM
Cache256MB
FeaturesOptimized for NAS with AgileArray AgileArray uses dual-plane balancing and time-limited error recovery (TLER) to deliver best-in-class RAID performance in multi-bay systems.
Always On, Always Accessible IronWolf Pro drives are designed for 24x7 performance, allowing users to access their data anytime, anywhere.
All-CMR Portfolio All IronWolf Pro drives utilize conventional magnetic recording (CMR) technology for consistent, best-in-class NAS performance.
Up to 20TB Broad range of high-performance capacity options to deliver scalable and costefficient storage solutions.
Built Tough Ir
UsageEnterprise NAS Hard Drives
Form Factor3.5"
Height (maximum)26.11mm
Width (maximum)101.85mm
Length (maximum)146.99mm
Shipping weight0.64 kg
Package size152 × 102 × 25 mm

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Questions about this item

Should I pick the 12TB IronWolf Pro or a smaller capacity for my NAS?

The 12TB model gives the highest single-drive capacity in the IronWolf Pro line, reducing the number of bays needed for a given raw total. Choose it if your NAS has limited slots or you want fewer drives to manage; choose a smaller capacity only if budget or rebuild-time risk favours spreading data across more spindles.

What does 7200 RPM mean for real-world NAS workloads?

7200 RPM keeps the platters spinning at a constant enterprise speed, so sustained sequential transfers stay high during long RAID rebuilds, video ingest or multi-user file serving without the latency spikes that variable-speed drives exhibit under heavy load.

How does the SATA 6.0Gb/s interface limit performance in a multi-bay RAID?

The SATA 6.0Gb/s link sets the maximum bus bandwidth each drive can use; in a multi-bay array the controller or HBA aggregates those links, so total array throughput scales with bay count while each individual drive remains capped at the SATA 6.0Gb/s ceiling.

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