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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

  • InterfaceSAS 12Gb/s
  • Capacity18TB
  • NAND Flash Memory TypeHard Drive
  • RPM7200 RPM
  • Cache256MB
  • Average Latency4.16ms

Options 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.

Highlights

  • 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

Specifications

BrandSeagate
SeriesExos X18
ModelST18000NM005J
InterfaceSAS 12Gb/s
Capacity18TB
NAND Flash Memory TypeHard Drive
RPM7200 RPM
Cache256MB
Average Latency4.16ms
FeaturesMarket-leading 18TB HDD offering the highest capacity available for more petabytes per rack
Highly reliable performance with enhanced caching, making it the logical choice for cloud data center and massive scale-out data center applications
Hyperscale SATA model tuned for large data transfers and low latency
PowerBalance feature optimizes Watts/TB
Maximize total cost of ownership savings through lower power and weight with helium sealed-drive design
Proven helium side-sealing weld technology for added handling robustness and leak protection
Digital environmental sensors to monitor in
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.85mm
Length (maximum)147.00mm
Shipping weight0.91 kg
Package size178 × 152 × 51 mm

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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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