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Silver 3.5 inch internal hard drive with label showing Seagate Exos X20 18TB

Seagate

Seagate Exos X20 ST18000NM003D 18TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive

SKU CH-7913-M1K0G

High-capacity 18TB 3.5-inch drive spinning at 7200 RPM with 256MB cache and SATA 6.0Gb/s interface for enterprise storage

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 18TB capacity stores massive datasets in a single 3.5" bay
  • 7200 RPM spindle delivers 4.16ms average latency for fast access
  • 256MB cache accelerates sustained read and write workloads
  • SATA 6.0Gb/s interface integrates directly into existing enterprise arrays
  • CMR recording technology ensures consistent performance for cloud-scale storage

Seagate Exos X20 18TB enterprise drive

The Seagate Exos X20 ST18000NM003D is a 3.5 inch internal hard drive with an 18TB capacity. It operates at 7200 RPM with a 256MB cache and connects via a SATA 6.0Gb/s interface. This CMR drive is built for enterprise storage environments.

Suited for high-capacity enterprise arrays

This drive suits data centres and cloud deployments that need maximum terabytes per rack with proven reliability. It is not for buyers who need the low latency of solid-state storage, nor for systems that lack a 3.5 inch bay and SATA power and data connections.

SATA 6.0Gb/s interface and 3.5 inch form factor

The drive uses the SATA 6.0Gb/s interface and a standard 3.5 inch form factor measuring 147.00mm long, 101.85mm wide and 26.10mm high. Verify that your chassis, backplane and controller support this physical size and SATA connection before purchase.

How it compares

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

Price $459.99
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 $25.56 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
Product lineExos X20
Model nameST18000NM003D
Total capacity18 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Recording methodCMR
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

Will the 3.5" 7200 RPM Exos X20 work in my existing SATA 6.0Gb/s bay alongside older drives?

Yes, the ST18000NM003D uses the standard SATA 6.0Gb/s interface and 3.5-inch form factor, so it fits the same bays and cables as earlier SATA drives.

How can I verify the 18TB CMR drive is healthy after installation?

Check that the BIOS or OS reports the full 18000 GB capacity, run a SMART short self-test and confirm the drive spins at 7200 RPM with no reallocated sectors.

Does the 256MB cache Exos X20 ship with mounting screws and a SATA data cable?

The drive is supplied as a bare unit; mounting screws and a SATA data cable are not included and must be sourced separately.

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