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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

  • InterfaceSATA 6.0Gb/s
  • Capacity20TB
  • NAND Flash Memory TypeHard Drive
  • Recording TechnologyCMR
  • RPM7200 RPM
  • Cache256MB
  • 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.

Highlights

  • 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

Specifications

BrandSeagate
SeriesExos X20
ModelST20000NM000D
InterfaceSATA 6.0Gb/s
Capacity20TB
NAND Flash Memory TypeHard Drive
Recording TechnologyCMR
RPM7200 RPM
Cache256MB
Average Latency4.16ms
FeaturesMarket-leading 20TB HDD offering the highest capacity available for more petabytes per rack*
Highly reliable performance with enhanced caching, making it the logical choice for cloud data center and massive scale-out data center applications
Hyperscale SATA model tuned for large data transfers and low latency
PowerBalance feature optimizes Watts/TB
Maximize total cost of ownership savings through lower power and weight with helium sealed-drive design
Proven helium side-sealing weld technology for added handling robustness and leak protection
Digital environmental sensors to monitor i
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.85mm
Length (maximum)147.00mm
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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