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Silver 3.5 inch enterprise hard drive with SAS connectors

Seagate

Seagate Exos X20 ST20000NM003D 20TB SAS 12Gb/s 3.5" internal hard drive

SKU CH-9R94-4Q55N

Enterprise-grade 3.5" hard drive delivering 20TB capacity with SAS 12Gb/s interface, 7200 RPM speed and 256MB cache for hyperscale storage

  • InterfaceSAS 12Gb/s
  • Capacity20TB
  • Recording TechnologyCMR
  • RPM7200 RPM
  • Cache256MB
  • Average Latency4.16ms
  • 20 TB capacity stores more data per rack
  • 7200 RPM and 256 MB cache deliver fast access
  • SAS 12 Gb/s interface enables high-throughput transfers
  • Helium-sealed design reduces power per terabyte
  • Seagate Secure encryption protects data at retirement

Capacity and Interface

The Seagate Exos X20 ST20000NM003D is a 20 TB enterprise hard drive with a SAS 12Gb/s interface and a 3.5 inch form factor. It spins at 7200 RPM with 256 MB cache and uses CMR recording technology for consistent performance. The helium-sealed design supports high-density storage in rack environments.

Enterprise Workloads Only

This drive suits hyperscale cloud data centres, massive scale-out deployments and high-capacity RAID arrays that require sustained throughput. Buyers who need a drive for a standard desktop PC or a single-bay external enclosure will find the SAS interface incompatible with typical consumer controllers.

SAS 12Gb/s Interface

The single specification that decides fit is the SAS 12Gb/s interface, which requires a compatible host bus adapter or RAID controller with SAS ports. Without that hardware the drive cannot be connected or used.

Highlights

  • 20 TB capacity stores more data per rack
  • 7200 RPM and 256 MB cache deliver fast access
  • SAS 12 Gb/s interface enables high-throughput transfers
  • Helium-sealed design reduces power per terabyte
  • Seagate Secure encryption protects data at retirement

Specifications

BrandSeagate
SeriesExos X20
ModelST20000NM003D
InterfaceSAS 12Gb/s
Capacity20TB
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

Questions about this item

Is the 20TB capacity the right choice for a hyperscale storage array?

Yes, the 20TB helium-sealed design delivers the highest capacity per drive, maximising petabytes per rack for scalable hyperscale and cloud data centre deployments.

How does the 7200 RPM speed affect real-world throughput in a server?

The 7200 RPM spindle combined with 256MB cache and SAS 12Gb/s interface provides high sustained transfer rates and low 4.16ms average latency for large sequential workloads.

What does the SAS 12Gb/s interface limit in practice?

The SAS 12Gb/s interface caps the maximum host transfer rate at 12Gb/s and supports hot-plug capability for enterprise storage arrays and RAID enclosures.

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