Seagate Exos X14 ST12000NM0278 12TB FastFormat 512e Enterprise SED SAS Hard Drive

Seagate Part #/MPN: ST12000NM0278

DiscTech Item #: SGT-ST12000NM0278-BN-5Y

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Enterprise Grade

Capacity: 12TB

Speed: 7,200RPM

Interface Types: SAS Serial Attached SCSI

Form Factor: 3.5inx1.0in LFF Hard Drive

Encryption/SED Supported

Sector Size: 512 / 512e

Sustained Throughput: 261/249

Average Seek Time: 4.16

Electrical Interface: SAS-3 Serial Attached SCSI v3 - 12.0Gbps

On-Board Cache: 256MB

Seagate Exos X14 ST12000NM0278 / 2H3211-002 12TB 3.5-Inch LFF 12Gbps 7.2K RPM FastFormat 512e Enterprise SED SAS Hard Drive - Brand New

Seagate Exos X14 ST12000NM0278 / 2H3211-002 12TB / 12000GB 3.5" LFF / Large Form Factor 12.0 Gb/s 7200 RPM FastFormat 512e / 512 Emulation Enterprise SED / Self Encrypting SAS / Serial Attached SCSI HDD / Hard Drive - Brand New

Seagate Exos X14 ST12000NM0278 12TB FastFormat is capable for 512e or 4Kn Enterprise SAS Hard Drives

Alt Model Number: 2H3201-002

Exos Enterprise X14 and X14z
Scalable. Responsive. Innovative.

Seagate manufactures hard drives that specifically address the needs of the hyperscale storage market. As the flagship of the Seagate X class, the Exos X14 and Exos X14z enterprise hard drives are the highest-capacity hard drives in the fleet.

Maximum Storage Capacity for Highest Rack Space Efficiency

  • 14TB per drive for 40% more petabytes per rack
  • Industry's lowest power and weight for optimum data center TCO
  • Highest 14TB hard drive performance with enhanced caching, making it perfect for big data applications
  • Hyperscale SATA model tuned for large data transfers
  • PowerBalance feature optimizes IOPS/Watt
  • Helium sealed-drive design with no porosity and uniform density
  • Superior material and weld-width design for a more robust, hermetically sealed-drive enclosure that protects from helium leaks
  • Digital environmental sensors for measuring internal pressure, helping to ensure high reliability, performance, and quality
  • Latest hermetic interconnect technology supporting higher data rate heads and higher pin counts for extreme thermal conditions
  • Proven enterprise-class reliability backed by 2.5M-hr MTBF rating

Best-Fit Applications

  • 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


  • All 4Kn/512e drives ship in 512-byte emulation mode and can be easily reformatted to 4Kn (and vice versa) with the FastFormat feature. New sector size will take effect only after a fast format
  • FastFormat is not compatible with 512n drives
  • FastFormat are only compatible with 512e and 4Kn Drives
  • Back up ALL data on drive when reformatting to FastFormat drives or all your data will be lost
  • T10 FastFormat conversion between 4Kn and 512e configurations is possible only if sector sizes are exact multiples of 8
  • Data must be aligned to 4K sectors to see improved performance in 4Kn fomat.


This drive is compatible with servers and arrays that accept 3.5inx1.0in LFF FastFormat SAS drives

Exos Enterprise X14
SED Model FastFormat (512e/4Kn)ST12000NM0278
Alternate Model Number2H3211-002
Interface12Gb/s SAS
Capacity12TB / 12000GB
Helium Sealed-Drive DesignYes
Protection Information (T10 DIF)Yes
Low HalogenYes
PowerChoice TechnologyYes
PowerBalance TechnologyYes
Hot-Plug SupportYes
Cache, Multisegmented (MB)256
Organic Solderability PreservativeYes
RSA 2048 Firmware VerificationYes
Reliability/Data Integrity
Mean Time Between Failures (MTBF, hours)2,500,000
Reliability Rating @ Full 24×7 Operation (AFR)0.35%
Nonrecoverable Read Errors per Bits Read1 Sector per 1015
Power-On Hours per Year (24×7)8760
512e Sector Size (Bytes per Sector)
  • 512
  • 520
  • 528
  • 4Kn Sector Size (Bytes per Sector)
  • 4096
  • 4160
  • 4224
  • Performance
    Spindle Speed (RPM)7200
    Interface Access Speed (Gb/s)
  • 12.0
  • 6.0
  • 3.0
  • Max Sustainable Transfer Rate
  • 261
  • 249
  • Random Rewad/Write 4K QD03 WCD (IOPS)170/418
    Average Latency (ms)4.16
    Interface PortsDual
    Rotational Vibration @ 20-1500Hz (rad/sec)12.5
    Power Consumption
    Idle A (W) Average
  • 5.0W
  • Max Operating, Random Read/Write 4K/16Q (W)
  • 10.2
  • 6.2
  • Power Supply Requirements+12 V and +5 V
    Temperature, Operating (°C)5°C - 60°C
    Vibration, Nonoperating: 2 to 500Hz (Grms)2.27
    Shock, Operating Read/Write (Gs)70/40Gs
    Shock, Nonoperating, 1ms/2ms (Gs)250
    Height (in/mm, max)1.028in/26.1mm
    Weight (in/mm, max)4.010in/101.85mm
    Depth (in/mm, max)5.787in/147.0mm
    Weigt (g/lb)690g/1.521lb

    Click here to view the manufacturer's item description/brochure

    ROHS Compliant

    Alternate MPNs: 2H3211-002

    Weight: 1.8 lb

    Warranty: 5 Year Manufacturer

    Brand New

    Condition Levels Explained

    The product is brand new.

    5 Year Manufacturer Warranty

    Product Warranties Explained

    The product has a manufacturer warranty for the time period specified.