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Seagate Exos X18 18TB 3.5 inch enterprise hard drive with SAS interface

Seagate

Seagate Exos X18 ST18000NM005J 18TB 7200 RPM 256MB Cache SAS 12Gb/s 3.5" internal hard drive

SKU CH-YX5X-1T4A5 MPN ST18000NM005J

Enterprise 3.5" SAS hard drive delivering 18TB at 7200 RPM with 256MB cache for high-density data-centre storage

  • Total capacity18 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB

Model SAS 12Gb/s

  • Highest capacity 18TB drive for maximum rack density
  • 7200 RPM and 256MB cache deliver reliable throughput
  • SAS 12Gb/s interface built for enterprise workloads
  • Helium-sealed design lowers power per terabyte
  • 5M-hour MTBF rating backs long-term operation

Enterprise SAS drive for 18TB capacity

The Seagate Exos X18 ST18000NM005J is an 18TB 3.5-inch hard drive built for enterprise storage arrays and hyperscale data centres. It runs at 7200 RPM with a 256MB cache and a SAS 12Gb/s interface. The helium-sealed design supports high areal density and a 2.5M-hour MTBF rating.

Installation requires SAS host bus adapter

This drive uses a SAS 12Gb/s interface and is not compatible with standard desktop PC motherboards that only provide SATA ports. A dedicated SAS HBA or RAID controller with appropriate cabling is required for connection. The 26.10mm z-height fits standard 3.5-inch drive bays, but the system must supply adequate cooling for 7200 RPM operation.

Verify controller and backplane support SAS

Before ordering, confirm that your storage chassis, backplane and host bus adapter all support 12Gb/s SAS signalling. The drive uses 512E/4Kn sector formats with Seagate Secure encryption, so the controller must handle those formats. Ensure the enclosure provides sufficient airflow for the helium-sealed mechanism and that your firmware recognises 18TB capacity.

How it compares

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

Price $391.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 18 TB
Higher than about 93% of the 2,372 comparable items (median 2 TB).
Price per TB $21.78 per TB
Cheaper than about 91% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos X18
Model nameST18000NM005J
Total capacity18 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 typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight0.91 kg
Package size178 × 152 × 51 mm

Other versions of this model

1 more in the same range

Questions about this item

How can I verify the Exos X18 ST18000NM005J is operating correctly after installation?

Check that the SAS 12Gb/s link negotiates at full speed, confirm the 18TB capacity appears in the RAID controller BIOS, and monitor SMART attributes for reallocated sectors and the 2.5M-hour MTBF rating during initial burn-in.

What ships with the ST18000NM005J and what must I source separately?

The drive itself in retail or OEM packaging; you must supply a SAS 12Gb/s HBA or RAID card, compatible backplane cables, a 3.5" drive bay with 26.10mm clearance, and 12V/5V power from the server chassis.

Which Exos X18 variant should I choose for a high-density storage node?

Select the ST18000NM005J with 18TB capacity, 7200 RPM, 256MB cache, SAS 12Gb/s interface and 512E/4KN SED format to maximise petabytes per rack and enable Seagate Secure instant erase.

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