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Silver 3.5 inch internal hard drive with SAS connector and label showing 18 TB capacity

Seagate

Seagate Exos X18 ST18000NM004JProduct 18 TB SAS 12Gb/s 3.5" internal hard drive

SKU CH-FRKJ-3FTM7 MPN ST18000NM004JProduct

An 18 TB SAS 12Gb/s 3.5" internal hard drive with 7200 RPM spindle speed and 256 MB cache for storage and surveillance systems

  • Total capacity18 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeSLC
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 18 TB capacity for massive data storage
  • SAS 12Gb/s interface delivers high throughput
  • 7200 RPM spindle speed enables fast access
  • 256 MB cache buffers heavy workloads
  • Hot-pluggable 3.5" design simplifies drive replacement

Exos X18 18 TB SAS enterprise drive

The Seagate Exos X18 ST18000NM004J is an 18 TB internal hard drive built for storage systems and video surveillance deployments. It runs at 7200 RPM with a 256 MB cache and uses a 512e/4Kn disk format. The 3.5-inch form factor fits standard enterprise bays and the drive is hot-pluggable for service without downtime.

Who this suits and who should look elsewhere

This drive suits operators who need high-capacity nearline storage on a 12Gb/s SAS fabric with hot-plug support. It is not for systems that lack SAS backplane or controller infrastructure, nor for workloads that demand solid-state latency or a different physical interface.

Deciding specification — 12Gb/s SAS interface

The single specification that decides fit is the 12Gb/s SAS interface, which requires a compatible SAS HBA, RAID controller or backplane to operate. Without that host-side support the drive cannot be connected or used.

How it compares

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

Price $416.99
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 $23.17 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
Part numberST18000NM004J
Total capacity18 TB
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeSLC
Cache memory256 MB
Ports & slots
Interface typeSAS 12Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

What are the exact height, width and depth measurements for the 3.5" Exos X18 drive?

The drive measures 1" high, 4" wide and 5.8" deep, fitting standard 3.5" internal bays.

Does the SAS 12Gb/s interface support hot-plug insertion, and what is the common mistake?

Yes, the drive is hot-pluggable; the common error is inserting it into a backplane that only supports 6Gb/s SAS, which limits speed.

When should the 256 MB cache and 7200 RPM spindle be monitored for replacement?

Monitor SMART attributes for reallocated sectors or rising seek errors; replace the drive if either trend accelerates.

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