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Silver 3.5-inch bare SATA hard drive with exposed circuit board

Seagate

Seagate Exos X18 ST18000NM000J 18TB 7200 RPM 256MB SATA 3.5" internal hard drive

SKU CH-W5JY-Y8MA3

An 18 TB, 7200 RPM SATA enterprise hard drive with 256 MB cache and helium-sealed design for high-capacity data-centre storage

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • 18 TB capacity stores more data per rack
  • 7200 RPM spindle speed enables fast sequential throughput
  • 256 MB cache improves burst performance
  • Helium sealed design reduces power per terabyte
  • SATA 6.0 Gb/s interface fits existing enterprise infrastructure

18 TB Enterprise SATA Drive

The Seagate Exos X18 ST18000NM000J is an 18 TB 3.5-inch internal hard drive built for enterprise storage. It spins at 7200 RPM with a 256 MB cache and connects via a SATA 6.0Gb/s interface. The helium-sealed design supports high-capacity rack deployments.

Suited for Bulk Data Centres

This drive fits cloud data centres and massive scale-out environments that prioritise maximum capacity per rack and low power per terabyte. Buyers who need faster random-access latency or a smaller physical footprint should look at other storage types.

SATA 6.0Gb/s Interface Decides Fit

The single specification that determines compatibility is the SATA 6.0Gb/s interface. Your server or storage array must provide a matching SATA port and 3.5-inch bay with adequate cooling for a 7200 RPM helium drive.

How it compares

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

Price $504.99
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 $28.06 per TB
Cheaper than about 85% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineExos X18
Model nameST18000NM000J
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 typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm

Questions about this item

What does the 18 TB capacity mean once the drive is installed in a real machine?

The drive provides 18 TB of raw storage for enterprise workloads, using a helium-sealed design and 7200 RPM platters to deliver high capacity per rack.

What does the SATA 6.0 Gb/s interface cap in practice?

The SATA 6.0 Gb/s link limits maximum transfer rate to 6.0 Gb/s, so sustained throughput cannot exceed that ceiling regardless of the 256 MB cache.

What physical space and mounting does the 3.5 inch form factor need?

It fits a standard 3.5 inch bay with maximum dimensions of 147.00 mm length, 101.85 mm width and 26.10 mm height.

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