We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • InterfaceSAS 12Gb/s
  • Capacity18TB
  • NAND Flash Memory TypeSLC
  • RPM7200 RPM
  • Cache256MB
  • Form Factor3.5"
  • 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.

Highlights

  • 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

Specifications

BrandSeagate
Part NumberST18000NM004J
InterfaceSAS 12Gb/s
Capacity18TB
NAND Flash Memory TypeSLC
RPM7200 RPM
Cache256MB
Form Factor3.5"

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.