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Silver 3.5 inch internal hard drive with green circuit board visible on underside

Seagate

Seagate Exos X20 ST20000NM007DProduct 20TB 7200 RPM SATA 6.0Gb/s 256MB 3.5" internal hard drive

SKU CH-B649-EZZDM MPN ST20000NM007DProduct

A 20 TB enterprise hard drive with 7200 RPM, 256 MB cache and SATA 6.0 Gb/s interface for high-capacity storage systems

  • Total capacity20 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory capacityHard Drive
  • Flash memory typeSLC
  • Recording methodCMR

Model 20TB Exos X20

  • 20TB capacity stores massive datasets in a single 3.5" drive
  • 7200 RPM spindle speed delivers fast sequential throughput for heavy workloads
  • 256MB cache buffers bursts to sustain consistent performance
  • 5M-hour MTBF rating supports continuous operation in enterprise arrays
  • SATA 6.0Gb/s interface integrates directly into existing storage infrastructure

Capacity and interface

The Seagate Exos X20 ST20000NM007D is a 20TB 3.5-inch internal hard drive with a SATA 6.0Gb/s interface and 7200 RPM spindle speed. It uses conventional magnetic recording and a 256MB cache to deliver high sequential throughput for enterprise storage arrays and hyperscale applications. The 512e/4Kn format supports modern operating systems and legacy controllers alike.

System compatibility

Verify that your host has a free 3.5-inch drive bay and a SATA 6.0Gb/s port capable of 600 MB/s transfer rates. The drive measures 147mm long, 101.85mm wide and 26.10mm high, so confirm physical clearance in compact chassis. A SATA power connector is required; the unit is hot-pluggable for supported backplanes.

Upgrade path

This model replaces lower-capacity 3.5-inch enterprise drives where rack density and cost per terabyte are primary concerns. The jump is worthwhile when workloads demand 2.5M-hour MTBF reliability, sustained random performance of 168000 read and 550000 write IOPS, and the lowest total cost of ownership for massive scale-out deployments.

How it compares

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

Price $563.99
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 $28.20 per TB
Cheaper than about 85% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineX20
Model nameST20000NM007D
Total capacity20 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Memory
Flash memory capacityHard Drive
Storage
Flash memory typeSLC
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

Other versions of this model

2 more in the same range

Questions about this item

Does the Seagate Exos X20 ST20000NM007D include mounting screws or a SATA cable, or must they be purchased separately?

The drive is supplied as a bare 3.5" unit; mounting screws and a SATA data cable are not included and must be sourced separately.

Should I choose the 512e or 4Kn disk format for a modern server running a recent Linux kernel?

The drive supports both 512e and 4Kn; 4Kn is preferred on modern Linux kernels for full 4 KB sector efficiency, while 512e maintains compatibility with older systems.

What sustained throughput can I expect from the 7200 RPM SATA 6.0Gb/s interface once the drive is installed in a RAID array?

The SATA 6.0Gb/s link caps at 600 MB/s; real-world sustained transfer rates will be lower and depend on workload, but the interface itself does not exceed 600 MB/s.

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