Product Specifications

Seagate Exos X24 ST20000NM002H 20TB 3.5-Inch Enterprise SATA Hard Drive

Product Overview

The Seagate Exos X24 (ST20000NM002H) is a flagship enterprise-class 3.5-inch hard drive built for hyperscale data centres, cloud storage platforms, and mission-critical environments demanding maximum storage density. With a massive 20TB storage capacity and a SATA 6Gb/s interface, this drive delivers exceptional throughput, energy efficiency, and long-term reliability for large-scale data analytics, enterprise servers, and high-density storage arrays.

As the highest-capacity drive in Seagate's Exos X fleet, the X24 is built on a globally proven platform deployed by leading cloud service providers worldwide. Featuring a helium-sealed CMR design, a 512MB multisegmented cache, and a 2.5 million-hour MTBF, it is purpose-built for continuous 24/7 operation in the most demanding data centre environments.

Key Features

Massive 20TB Storage Capacity

The Exos X24 delivers 20TB of enterprise-grade storage per drive, enabling organisations to maximise rack-space efficiency and achieve more petabytes per rack unit. This makes it the ideal choice for high-density deployments, cloud data centres, and scale-out architectures where capacity per rack is the primary constraint.

SATA 6Gb/s Interface with Up to 285 MB/s Transfer Rate

Equipped with a SATA III 6Gb/s interface, the drive achieves a maximum sustained data transfer rate of up to 285 MB/s, ensuring fast sequential read/write performance for large-scale data ingestion, retrieval, and analytics workloads. The large 512MB multisegmented cache with advanced write caching further boosts throughput for data-intensive applications.

Enterprise-Grade Reliability

Rated for a workload of 550TB/year with a 2.5 million-hour MTBF and an annualised failure rate (AFR) of just 0.35%, the Exos X24 is engineered for uninterrupted, non-stop operation. Super Parity technology provides an additional layer of data integrity across large RAID arrays, while on-the-fly error-correction algorithms and S.M.A.R.T. monitoring ensure consistent performance under heavy, continuous workloads.

Helium-Sealed CMR Design

The hermetically sealed helium-filled enclosure combined with Conventional Magnetic Recording (CMR) technology delivers high areal density, reduced power consumption, lower operating temperatures, and minimal vibration. The helium seal also provides enhanced robustness, durability, and leak protection — all critical advantages in dense rack-mounted server environments running 24/7.

Advanced Power Management

Seagate's PowerBalance™ and PowerChoice™ idle power technologies allow IT administrators to fine-tune the balance between performance and energy consumption, significantly reducing total cost of ownership (TCO) at scale. Built-in digital environmental sensors further optimise power usage, making it an ideal choice for energy-conscious hyperscale deployments.

Seagate Secure™ with Instant Secure Erase

The Exos X24 features Instant Secure Erase (ISE) for fast, safe, and cost-effective drive repurposing and disposal. Optional Self-Encrypting Drive (SED) and FIPS 140-3 validated models are available, offering government-grade data-at-rest protection and full compliance with corporate and federal security standards throughout the drive's entire lifecycle.

FastFormat™ Technology

Supporting both 512e and 4Kn sector formats, the Exos X24 includes Seagate's FastFormat™ feature, enabling easy reformatting between sector sizes without drive replacement — providing flexibility for evolving infrastructure requirements and ensuring compatibility with both legacy and modern enterprise systems.

Hot-Plug Support

With native hot-plug support, the Exos X24 can be inserted or removed from a live system without causing downtime, making it ideal for enterprise SATA storage arrays and high-availability server environments that require continuous, uninterrupted operation around the clock.

Best-Fit Applications

• Hyperscale cloud data centres and object storage
• Massive scale-out data centres and big data applications
• High-capacity density RAID storage arrays
• Mainstream enterprise external storage arrays
• Distributed file systems including Hadoop and Ceph
• Enterprise backup, restore, and virtual tape (D2D)
• Centralised surveillance and video analytics storage

What's in the Box

• 1x Seagate Exos X24 ST20000NM002H 20TB 3.5-Inch SATA Hard Drive
• Product documentation / warranty card