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Standard 3.5 inch silver hard drive with label showing 18TB capacity and model ST18000NM003D

Seagate

Seagate Exos X20 ST18000NM003D 18TB 7200 RPM SATA 3.5in internal hard drive

SKU CH-D5P2-KVTZQ

An 18 TB 3.5-inch SATA drive with 7200 RPM, 256 MB cache and CMR recording 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
  • 18 TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM spindle speed delivers fast sequential throughput for enterprise workloads
  • 256 MB cache accelerates random read and write operations
  • CMR recording technology ensures consistent performance in RAID and NAS arrays
  • Helium-sealed design lowers power consumption per terabyte

18TB CMR Enterprise Hard Drive

The Seagate Exos X20 ST18000NM003D is an 18TB 3.5-inch internal hard drive built for enterprise storage. It spins at 7200 RPM with a 256MB cache and uses the SATA 6.0Gb/s interface. CMR recording technology and a helium-sealed design support high-capacity workloads in standard drive bays.

Suited for NAS and Data-Center Arrays

This drive targets cloud storage, hyperscale deployments, and NAS systems such as Synology or QNAP. It handles big-data analytics, object storage, distributed file systems, and enterprise backup. Builders who need a smaller capacity or a different form factor should look elsewhere.

SATA 6.0Gb/s Interface Decides Compatibility

The single specification that determines fit is the SATA 6.0Gb/s interface. Your system or enclosure must provide a standard SATA data and power connection for this 3.5-inch drive to operate.

How it compares

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

Price $431.99
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 $24.00 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
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-inch form factor with 26.10mm height fit my standard desktop drive bay?

Yes, the drive measures 147.00mm long, 101.85mm wide and 26.10mm high, matching the standard 3.5-inch desktop bay dimensions.

What is the correct way to connect the SATA 6.0Gb/s interface, and what common mistake should I avoid?

Attach both the SATA data cable and the 15-pin SATA power connector; a frequent error is leaving the power cable unseated, which prevents the drive from spinning up.

The helium-sealed design and 2,500,000 MTBF rating suggest long life — what maintenance or replacement should I plan for?

No user-serviceable parts exist inside the sealed helium enclosure; monitor SMART attributes for reallocated sectors and replace the drive if the health indicators degrade.

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