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Silver 3.5 inch hard drive with label showing Seagate Exos X18 12TB

Seagate

Seagate Exos X18 ST12000NM000J 12TB 7200 RPM 256MB SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-1YXM-K0MN2 MPN ST12000NM000J

Enterprise 12 TB hard drive with 7200 RPM, 256 MB cache and SATA 6.0 Gb/s interface

  • Total capacity12 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 12TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM spindle speed delivers fast sequential access for enterprise workloads
  • 256MB cache buffers bursts and reduces average latency to 4.16ms
  • SATA 6.0Gb/s interface provides broad compatibility with existing servers
  • Helium-sealed design lowers power per terabyte and cuts weight for rack density

Enterprise capacity drive

The Seagate Exos X18 ST12000NM000J is a 12TB 3.5-inch hard drive built for enterprise storage workloads. It spins at 7200 RPM with a 256MB cache and connects through a SATA 6.0Gb/s interface. Helium-sealed construction and PowerBalance technology optimise watts per terabyte for large-scale deployments. Digital environmental sensors monitor internal conditions for consistent operation.

Suits hyperscale and archive workloads

This drive targets cloud data centres and massive scale-out environments that prioritise capacity density and total cost of ownership. Buyers who need the 18TB maximum capacity mentioned in the series highlights should look at a higher-capacity model. Systems requiring a different interface or a smaller form factor cannot use this SATA 3.5-inch unit.

SATA 6.0Gb/s interface decides fit

The drive communicates over SATA 6.0Gb/s, so the host must provide a compatible SATA port and supporting backplane. Average latency is 4.16ms at 7200 RPM. Physical dimensions are 147.00mm length, 101.85mm width and 26.10mm height for standard 3.5-inch bay planning.

How it compares

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

Price $506.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 12 TB
Higher than about 90% of the 2,372 comparable items (median 2 TB).
Price per TB $42.25 per TB
Cheaper than about 68% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos X18
Model nameST12000NM000J
Total capacity12 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Flash memory typeHard Drive
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.68 kg
Package size152 × 102 × 25 mm

Questions about this item

Do I need a SATA 6.0Gb/s cable and a 3.5" drive bay with SATA power to install the 12TB Exos X18?

Yes, the drive uses a standard SATA 6.0Gb/s data connector and requires a 3.5" bay with a SATA power connector; the 26.10mm height fits typical desktop cages.

Will the ST12000NM000J work on a motherboard that only supports SATA 3.0Gb/s?

The SATA 6.0Gb/s interface is backward compatible, so the 12TB drive will operate at the 3.0Gb/s link speed on older controllers.

How can I verify the 7200 RPM Exos X18 is healthy after installation?

Check SMART data for zero reallocated sectors, confirm the firmware reports 12TB capacity and 256MB cache, and listen for steady 7200 RPM operation without unusual noise.

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