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Seagate Exos X20 3.5-Inch Internal 512e/4Kn SATA Enterprise Hard Drive
Delivering maximum storage capacity with the highest rack-space efficiency.

Seagate Exos X20 3.5-Inch Internal 512e/4Kn SATA Enterprise Hard Drive

Seagate Products
Seagate Exos X20 3.5-Inch Enterprise Hard Drives - 512e/4Kn SATA
Seagate Exos X20 3.5-Inch Internal 512e/4Kn SATA Enterprise Hard Drive - 18 TB
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Seagate Exos X20 3.5-Inch Internal 512e/4Kn SATA Enterprise Hard Drive - 20 TB
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Seagate Exos X20 3.5-Inch Enterprise Hard Drives - 512e/4Kn SATA SED
Seagate Exos X20 3.5-Inch Internal 512e/4Kn SATA SED Enterprise Hard Drive - 18 TB
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Seagate Exos X20 3.5-Inch Internal 512e/4Kn SATA SED Enterprise Hard Drive - 20 TB
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Exos EnterpriseOverview:

Scalable. Responsive. Innovative.

Powerful performance with proven technology—Seagate’s Exos X20 drives are built off the platform that’s shipped millions globally and deployed in leading cloud service provider solutions—making them the most sought after drives in our datasphere. Designed with the highest rack-space efficiency and protected with Seagate Secure, Exos X20 offers extreme market-leading capacity, earning customer confidence by delivering trusted peace of mind.

Best-Fit Applications

  • Scalable hyperscale applications/cloud data centers
  • Massive scale-out data centers
  • Big data applications
  • High-capacity density RAID storage
  • Mainstream enterprise external storage arrays
  • Distributed file systems, including Hadoop and Ceph
  • Enterprise backup and restore— D2D, virtual tape
  • Centralized surveillance


Maximum Storage Capacity for Highest Rack Space Efficiency

  • Market-leading 20TB HDD offering the highest capacity available for more petabytes per rack1
  • 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 internal drive conditions for optimal operation and performance
  • Data protection and security— Seagate Secure features for safe, affordable, fast, and easy drive retirement
  • Proven enterprise-class reliability backed by 5-year limited warranty and 2.5M-hr MTBF rating

Superior Reliability

Enterprise-class drives with a 550TB/year workload rating and 2.5M-hr MTBF to meet the most demanding storage requirements.

Customizable Power Options

PowerChoice and PowerBalance for optimized power consumption when in use and idle—customizable to fit your needs.

Amazing Performance

Advanced write caching coupled with up to 285 MB/s data transfer rates provides a boost in performance without compromising on capacity.

Seagate Secure

Advanced Data Security

Password protection and AES-256 hardware encryption with Seagate Secure—for drives you can depend on.

1 Compared to 18TB competitive product.


Specifications 20TB 18TB
Standard Model FastFormat (512e/4Kn)1 ST20000NM007D ST18000NM003D
SED Model FastFormat (512e/4Kn)1,2 ST20000NM000D ST18000NM004D
SED-FIPS FastFormat (512e/4Kn)1,2
Interface SATA 6Gb/s SATA 6Gb/s
Helium Sealed-Drive Design Yes Yes
Conventional Magnetic Recording (CMR) Yes Yes
Protection Information (T10 DIF)
SuperParity Yes Yes
Low Halogen Yes Yes
PowerChoice Idle Power Technology Yes Yes
PowerBalance Power/Performance Technology Yes Yes
Hot-Plug Support3 Yes Yes
Cache, Multisegmented (MB) 256 256
Organic Solderability Preservative Yes Yes
RSA 2048 Firmware Verification (SD&D) Yes Yes
Reliability / Data Integrity
Mean Time Between Failures (MTBF, hours) 2,500,000hr 2,500,000hr
Reliability Rating @ Full 24×7 Operation (AFR) 0.35% 0.35%
Nonrecoverable Read Errors per Bits Read 1 sector per 10E15 1 sector per 10E15
Power-On Hours per Year (24×7) 8760 8760
512e Sector Size (Bytes per Sector) 512 512
4Kn Sector Size (Bytes per Sector) 4096 4096
Limited Warranty (years) 5 5
Spindle Speed (RPM) 7200RPM 7200RPM
Interface Access Speed (Gb/s) 6.0, 3.0 6.0, 3.0
Max. Sustained Transfer Rate OD (MB/s,MiB/s) 285/272 285/272
Random Read/Write 4K QD16 WCD (IOPS) 168/550 168/550
Average Latency (ms) 4.16 4.16
Interface Ports Single Single
Rotation Vibration @ 1500 Hz (rad/s²) 12.5 12.5
Power Consumption
Idle A (W) Average 5.4W 5.4W
Max Operating, Random Read/Write 4K/16Q (W) 9.4, 6.4 9.4, 6.4
Power Supply Requirements +12 V and +5 V +12 V and +5 V
Temperature, Operating (°C) 5°C – 60°C 5°C – 60°C
Vibration, Nonoperating: 2 to 500Hz (Grms) 2.27 2.27
Shock, Operating 2ms (Read/Write) (Gs) 40 40
Shock, Nonoperating, 2ms (Gs) 200 200
Height (mm/in, max)4 1.028in/26.1mm 1.028in/26.1mm
Width (mm/in, max)4 4.010in/101.85mm 4.010in/101.85mm
Depth (mm/in, max)4 5.787in/147.0mm 5.787in/147.0mm
Weight (g/lb) 670g/1.477lb 670g/1.477lb
Carton Unit Quantity 20 20
Cartons per Pallet/Cartons per Layer 40 / 8 40 / 8

1 FastFormat models ship in 512e format state. When switching from 512e to 4Kn by executing the FastFormat routine, all data on the drive will be deleted. Note that data must be aligned to 4K sectors to see improved performance in 4Kn fomat.
2 Self-Encrypting Drives (SED) and FIPS 140-2 Validated drives available through franchised authorized distributors. May require TCG-compliant host or controller support.
3 Supports Hotplug operation per Serial ATA Revision 3.3 specification
4 These base deck dimensions conform to the Small Form Factor Standard (SFF-8301) found at For connector-related dimensions, see SFF-8323.


Download the Seagate Exos X20 3.5-Inch Enterprise HDD Datasheet (.PDF)