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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

  • Total capacity20 TB
  • Interface typeSAS 12Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 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.

How it compares

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

Price $515.99
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 $25.80 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 nameST20000NM003D
Total capacity20 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Recording methodCMR
Cache memory256 MB
Ports & slots
Interface typeSAS 12Gb/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

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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