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Seagate

Seagate Exos X20 ST20000NM003D 20TB SAS Enterprise HDD

Enterprise-grade 20TB SAS drive with 2.5M-hour MTBF and CMR technology for maximum capacity and reliability.

$514.10*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The Seagate Exos X20 ST20000NM003D is a 20TB enterprise hard drive built for organizations that need maximum storage density without sacrificing reliability. Using Conventional Magnetic Recording (CMR) technology, it avoids the write performance limitations found in SMR drives, making it well-suited for workloads that involve sustained or random write operations. The 12Gb/s SAS interface delivers the throughput required by enterprise storage arrays, RAID controllers, and data center infrastructure.

With a rated mean time between failures (MTBF) of 2.5 million hours and Seagate Secure data protection features, this drive is designed for always-on environments where downtime is costly. The 256MB cache helps smooth data transfers during demanding operations. Backed by a 5-year limited warranty, the Exos X20 is positioned as a workhorse for organizations looking to consolidate storage while maintaining the performance and dependability that enterprise applications demand.

Key Features

Provides fast and dependable access to data and has non-volatile memory

Internal drive type for a reliable and convenient storage solution

With 20 TB capacity you have ample space for storing millions of images, hundreds of hours of video or for music lovers, up to a million songs

12Gb/s SAS interface for high speed and reliability

Experience rapid processing speed with 256 MB cache buffer

Specifications

Brand
Seagate
Model
ST20000NM003D
Capacity
20 TB
Interface
SAS (12Gb/s)
Recording Method
Conventional Magnetic Recording (CMR)
Cache
256 MB
Form Factor
Internal - 3.5"
MTBF
2.5 Million Hours
Warranty
5-Year Limited

Pros & Cons

👍 Pros

  • Massive 20TB capacity reduces the number of drives needed in storage arrays.
  • CMR recording delivers consistent write performance with no rewrite overhead.
  • 2.5 million-hour MTBF rating provides enterprise-grade reliability.
  • 12Gb/s SAS interface supports high-throughput enterprise environments.
  • 5-year limited warranty offers long-term peace of mind.

👎 Cons

  • SAS interface requires a compatible HBA or RAID controller and will not work with standard consumer SATA ports.
  • Large capacity means a single drive failure puts a significant amount of data at risk without proper RAID or backup.
  • Higher price point compared to consumer-grade drives of similar capacity.
  • 3.5-inch form factor limits use to desktops and rack-mounted systems.

Frequently Asked Questions

This drive uses a 12Gb/s SAS interface, which is standard for enterprise servers and storage arrays. It is not compatible with consumer SATA-only systems.
It uses Conventional Magnetic Recording (CMR), which provides consistent write performance without the rewrite penalties associated with Shingled Magnetic Recording (SMR).
Seagate backs the Exos X20 with a 5-year limited warranty.
The ST20000NM003D has a 256MB cache buffer.
It is engineered for enterprise workloads including data centers, NAS arrays, and high-capacity storage servers that require sustained reliability and large-volume storage.

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