Seagate Exos X18 18TB 3.5" Enterprise HDD

Internal HDD • By Seagate


form factor 3.5"

Described by Seagate

Exos X18 HDD 512E/4KN SATA, 18TB, 3.5", 7200 RPM, 256 MB cache, NO ENCRYPTION

Seagate manufactures hard drives that specifically address the demand for hyperscale cloud scalability. As the flagship of the Seagate® X class, the Exos® X18 enterprise hard drives are the highest-capacity hard drives in the fleet.

Market-leading 18TB 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 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 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


Cache 256MB
Capacity 18TB
Form Factor 3.5"
Interface SATA 6Gb/s
Product Family Exos
Series Exos X18
Warranty 5 Years Limited
Weight 670g
Bytes per Sector 512
Max. Sustained Transfer Rate OD (MB/s, Mib/s) 270/258



Shock, Nonoperating 2ms (Gs) 200
Shock, Operating 2 ms Read/Write (Gs) 50
Temperature, Operating 5°C – 60°C


Power Consumption

Idle Power, Average (W) 5.3W
Max Operating, Random Read/Write 4K/1 QD 16 WCD (IOPS) 170/550
Power Supply Requirements +12 V and +5 V


Reliability/Data Integrity

MTBF 2,500,000 hours
Power-On Hours per Year 8760
Reliability Rating @ Full 24?7 Operation (AFR) 0.35%


Type Internal HDD
Brand Seagate
Series Exos X18
Model Seagate Exos X18 18TB 3.5" Enterprise HDD
MPN ST18000NM000J
Barcode 0763649138878