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Standard 3.5-inch silver hard drive with label showing 18TB capacity

Seagate

Seagate Exos X18 18TB 7200 RPM 256MB SATA 3.5" internal hard drive

SKU CH-F6ET-9PZC5

High-capacity 18TB enterprise drive with 7200 RPM speed and 256MB cache for demanding data centre workloads

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • Average seek time4.1 ms
  • 18 TB capacity in a standard 3.5 inch form factor
  • 256 MB cache boosts sustained throughput for heavy workloads
  • 7200 RPM spindle speed delivers 4.1 ms average seek time
  • 5 million hour MTBF rating supports continuous enterprise operation
  • Helium side-sealing weld technology protects against leaks and handling stress

Enterprise Capacity for Data Centres

The Seagate Exos X18 is an 18TB 3.5-inch internal hard drive built for cloud data centres, hyperscale storage and enterprise NAS systems. It targets operators who need maximum capacity per drive bay in always-on environments. The SATA 6.0Gb/s interface and 256MB cache support heavy read and write workloads across RAID arrays and distributed file systems.

Sustained Workload Behaviour

Rated at 2.5M hours MTBF, the drive is engineered for continuous operation rather than burst transfers. Helium side-sealing weld technology and PowerBalance optimisation keep power draw proportional to capacity during extended duty cycles. The 7200 RPM spindle and 4.1ms average seek time deliver consistent throughput for backup, restore and scale-out applications.

Capacity Decides Fit

The single specification that determines suitability is the 18TB capacity in a standard 3.5-inch form factor. Systems requiring denser storage per slot will match this drive; builds needing less raw space or a smaller physical size will not.

How it compares

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

Price $461.99
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 $25.67 per TB
Cheaper than about 88% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Part numberST18000NM000J
Total capacity18 TB
Performance
Rotational speed7,200 RPM
Average seek time4.1 ms
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)

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