Seagate Exos X18 ST12000NM000J 12TB 7200RPM SATA 6Gb/s 256MB Cache Enterprise Hard Drive – Helium Sealed, PowerBalance™, 2.5M-Hour MTBF, 24×7 Reliability, CMR Design

Seagate Exos X18 ST12000NM000J 12TB 7200RPM SATA 6Gb/s 256MB Cache Enterprise Hard Drive – Helium Sealed, PowerBalance™, 2.5M-Hour MTBF, 24×7 Reliability, CMR Design

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🧠 Expert Features

  • Scalable. Responsive. Innovative. Designed for hyperscale storage environments, the Seagate Exos X18 12TB (ST12000NM000J) leads the X-Class fleet with enterprise-grade density and rock-solid reliability.
  • Hyperscale Powerhouse: Optimized for cloud data centers, massive scale-out storage, and big data environments like Hadoop® and Ceph®.
  • 12TB of Raw Storage Brilliance: Delivering rack-level efficiency, this 3.5-inch SATA monster packs the highest petabyte density per rack, perfect for enterprise and cloud-scale operations.
  • Helium-Sealed Design: Seagate’s advanced helium drive architecture cuts power usage, reduces drag, and boosts capacity — resulting in cooler, quieter, and lighter operation.
  • PowerBalance™ and PowerChoice™: Smart firmware features that fine-tune watts per terabyte to squeeze every drop of efficiency out of your rack.
  • Ultra-Fast Data Throughput: Sustained 270MB/s transfer rates and 7200RPM rotational speed ensure low latency and responsive large-data transfers.
  • SuperParity Data Protection: Enhanced error correction and data integrity for long-term dependability in RAID and JBOD environments.
  • Digital Environmental Sensors: Intelligent internal sensors actively monitor vibration, temperature, and performance to maintain enterprise-grade consistency.
  • Seagate Secure™ Protection: Built-in features enable fast, safe, and cost-effective drive retirement — your data stays yours, always.
  • Built for Continuous 24×7 Operation: With 2.5 million hours MTBF, 0.35% AFR, and a 1-year limited warranty, this drive thrives in non-stop enterprise workloads.
  • Best For: Cloud data centers, enterprise backup and restore, D2D, massive file systems, RAID arrays, centralized surveillance, and hyperscale applications.

💾 Expert Specs

Category Details
Model Number ST12000NM000J
Series Seagate Exos X18
Capacity 12TB
Interface SATA 6Gb/s
Spindle Speed (RPM) 7200RPM
Cache (Multisegmented) 256MB
Max Sustained Transfer Rate (MB/s, MiB/s) 270 / 258
Random Read/Write 4K QD16 (IOPS) 170 / 550
Average Latency 4.16ms
Interface Ports Single
Workload Rate Limit 550TB/year
Mean Time Between Failures (MTBF) 2,500,000 hours
Reliability Rating (AFR) 0.35%
Nonrecoverable Read Errors per Bits Read 1 sector per 10¹⁵ bits
Power-On Hours (per Year) 8,760 (24×7)
Helium Sealed-Drive Design Yes
Conventional Magnetic Recording (CMR) Yes
SuperParity Technology Yes
Protection Information (T10 DIF) No
Low Halogen Yes
PowerChoice™ Idle Power Technology Yes
PowerBalance™ Optimization Yes
Hot-Plug Support Yes
RSA 3072 Firmware Verification (SD&D) Yes
Idle Power (Average) 4.4W
Max Operating Power (Random 4K/16Q) 8.6W / 5.8W
Power Requirements +12V / +5V
Operating Temperature 5°C – 60°C
Non-Operating Vibration (2–500Hz) 2.27 Grms
Shock (Operating Read/Write) 50 Gs
Shock (Non-Operating) 200 Gs
Form Factor 3.5-inch
Height 26.1mm / 1.028in
Width 101.85mm / 4.010in
Depth 147.0mm / 5.787in
Weight 650g / 1.433lb
Carton Unit Quantity 20
Cartons per Pallet / Layer 40 / 8

🧩 Expert Verdict

The Seagate Exos X18 ST12000NM000J isn’t just a hard drive — it’s an enterprise storage tank with a helium heart. Built for hyperscale speed, reliability, and uptime, it devours data-heavy workloads with surgical precision. Whether you’re architecting cloud storage, managing a distributed file system, or backing up mission-critical enterprise data, this drive stays cool, stable, and powerful — 24×7, no excuses.

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