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Silver 3.5-inch hard drive with label showing 20TB capacity

Seagate

Seagate ST20000NM000D Exos X20 20TB 7200 RPM 256MB SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-7MB7-7PD5G MPN ST20000NM000D

Enterprise-class 20TB CMR drive spinning at 7200 RPM with 256MB cache and a SATA 6.0Gb/s interface for high-capacity storage arrays

  • Total capacity20 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • 20TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM spindle speed delivers fast data access for enterprise workloads
  • 256MB cache buffers bursts to sustain high throughput
  • CMR recording technology ensures consistent write performance
  • Helium-sealed design reduces power draw per terabyte

Exos X20 20TB enterprise hard drive

The Seagate Exos X20 ST20000NM000D is a 3.5-inch internal hard drive built for enterprise storage environments. It delivers a 20TB capacity using conventional magnetic recording technology spinning at 7200 RPM with a 256MB cache. A SATA 6.0Gb/s interface connects the drive to host systems.

Suited for high-capacity RAID and archive workloads

This drive targets operators who need maximum terabytes per rack in cloud data centres or massive scale-out deployments. Its helium-sealed design and PowerBalance feature optimise watts per terabyte for total cost of ownership savings. Buyers needing solid-state speeds or a non-SATA interface should consider other storage types.

20TB CMR capacity on SATA 6.0Gb/s

The single specification that determines fit is the 20TB capacity delivered through CMR recording on a SATA 6.0Gb/s interface. This combination defines the drive's maximum sequential throughput and its compatibility with existing SATA backplanes and controllers. Verify that your enclosure and controller support 20TB SATA drives 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 $436.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 20 TB
Higher than about 94% of the 2,372 comparable items (median 2 TB).
Price per TB $21.85 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
Product lineExos X20
Model nameST20000NM000D
Total capacity20 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Flash memory typeHard Drive
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
Shipping weight0.91 kg
Package size196 × 152 × 76 mm

Questions about this item

Will this 20TB 3.5" SATA 6.0Gb/s drive work in a system that currently runs older 3.5" SATA drives?

Yes, it uses the standard SATA 6.0Gb/s interface and 3.5" form factor, so it connects to the same SATA data and power cables as your existing drives.

How can I verify the ST20000NM000D is performing correctly after installation?

The drive should identify as a 20TB CMR device spinning at 7200 RPM with 256MB cache; check SMART data for zero reallocated sectors and expect average latency near 4.16ms during benchmarks.

What comes in the box and what must I provide separately?

Packing varies between retail and OEM; the drive itself is the only guaranteed item, so plan to source mounting screws and SATA data and power cables separately.

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