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Seagate Exos X18 18TB 3.5in enterprise hard drive, silver aluminium casing, SATA connectors visible

Seagate

Seagate ST18000NM002J 18TB 7200 RPM SATA 6.0Gb/s 256MB 3.5in internal hard drive

SKU CH-MGBR-K6QPF MPN ST18000NM002J

An 18 TB 3.5" desktop drive with 7200 RPM SATA 6.0Gb/s interface, 256 MB cache, CMR recording, helium sealing and 24/7 enterprise rating

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • Recording methodCMR
  • 18TB capacity stores massive datasets
  • 7200 RPM spindle delivers 270 MB/s sustained throughput
  • Helium-sealed design enables 24/7 enterprise operation
  • 256MB cache accelerates frequent data access
  • CMR recording ensures broad system compatibility

18 TB Enterprise Drive for Servers and NAS

The Seagate Exos X18 ST18000NM002J delivers 18 TB of storage in a 3.5 inch form factor. It uses a SATA 6.0 Gb/s interface spinning at 7200 RPM with a 256 MB cache. CMR recording technology ensures consistent performance for enterprise servers, NAS appliances and workstation computers. The helium-sealed design supports 24/7 operation in multi-drive environments.

Helium Sealing Lowers Heat and Noise

Helium sealing reduces internal turbulence so the drive runs cooler and quieter than conventional air-filled units at the same spindle speed. The 7200 RPM motor sustains a data transfer rate up to 270 MB/s while maintaining enterprise-class reliability. Power draw stays predictable during continuous read and write workloads typical of backup and archiving tasks. Hot-swap support allows replacement without system downtime.

Fits Standard 3.5 Inch Bays and SATA Controllers

The 3.5 inch form factor mounts in any standard drive bay or hot-swap chassis using the SATA 6.0 Gb/s interface. No special controller or proprietary firmware is required; the dual-labelled drive works in HP and non-HP systems alike. The 512e sector format maintains compatibility with legacy operating systems and RAID controllers. This frees up M.2 slots for faster caching or boot devices.

How it compares

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

Price $424.99
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 $23.61 per TB
Cheaper than about 90% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate/HP
Product lineExos X18
Model nameST18000NM002J
Part number2TV133-065
Total capacity18 TB
Performance
Rotational speed7,200 RPM
Storage
Cache memory256 MB
Recording methodCMR
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

How do I install the 3.5in SATA drive and which step is often missed?

Mount the drive in a 3.5in bay, connect the SATA data and power cables, then enable hot-swap in the BIOS or RAID controller so the 24/7 rated drive can be swapped without shutdown.

What maintenance or replacement will the helium-sealed 18TB drive need later?

The sealed helium design eliminates internal maintenance; replace the unit when SMART data reports reallocated sectors or after the enterprise workload rating is exceeded.

What limit appears first during sustained 7200 RPM writes on this CMR drive?

The sustained transfer rate tops out at 270 MB/s, so the interface and media speed become the bottleneck before the 256MB cache fills.

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