Seagate Exos X20 20TB 3.5" Enterprise HDD

Internal HDD • By Seagate


form factor 3.5"

Described by Seagate

Exos X20 20TB 512E/4kn SATA, 7200RPM, 3.5", 256MB Cache, 5 Years Warranty

Delivering maximum storage capacity with the highest rack-space efficiency.

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."

Maximum Storage Capacity for Highest Rack
Space Efficiency
Market-leading 20 TB 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 centre and massive scale-out data centre applications
Hyperscale SATA model tuned for large data transfers and low latency
PowerBalance™ feature optimises Watts/TB
Maximise 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

  • Best-Fit Applications
  • Scalable hyperscale applications/cloud data centres
  • Massive scale-out data centres
  • 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
  • Centralised surveillance


Cache 256MB
Capacity 20TB
Form Factor 3.5"
Interface SATA
Product Family Exos
Series Exos X20
Warranty 5 Years
Weight 670 g
Max. Sustained Transfer Rate OD (MB/s, MiB/s) 285/272
Random Read/Write 4K QD16 WCD (IOPS) 168/550



Shock, Non-operating 2 ms (GS) 200
Shock, Operating 2 ms (Read/Write) (Gs) 40
Temperature, Operating 5°C – 60°C
Vibration, Non-operating: 2 to 500 Hz (Grms) 2.27


Power Consumption

Idle A (W) Average 5.4 W
Max Operating, Random Read/Write 4K/16Q (W) 9.4, 6.4
Power Supply Requirements +12 V and +5 V


Reliability/Data Integrity

512e Sector Size (Bytes per Sector) 512
MTBF 2,500,000 hours
Power-On Hours per Year (24?7) 8,760
Reliability Rating @ Full 24?7 Operation (AFR) 0.35%


Type Internal HDD
Brand Seagate
Series Exos X20
Model Seagate Exos X20 20TB 3.5" Enterprise HDD
MPN ST20000NM007D
Barcode 8719706031554