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Seagate 20TB Exos X24 7200 rpm SAS III 12 Gb/s 3.5" Internal HDD (OEM)

BH #SEST20NM007H • MFR #ST20000NM007H
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Seagate 20TB Exos X24 7200 rpm SAS III 12 Gb/s 3.5" Internal HDD (OEM)
Key Features
  • 20TB Storage Capacity
  • 3.5" Form Factor
  • SAS III 12 Gb/s Interface
  • 512MB Cache
The 20TB Exos X24 7200 rpm SAS III 12 Gb/s 3.5" Internal HDD from Seagate is a high-performance, large-capacity drive designed for data storage. It's suitable for engineering workstations, network servers, mainframes, supercomputers, and other demanding tasks that require 24/7 operation. This 7200 rpm drive utilizes the SAS III 12 Gb/s interface for data transfer rates of up to 285 MB/s. Moreover, as a professional-grade drive, it has an MTBF rating of 2.5 million hours as well as built-in digital sensors to ensure optimal performance, PowerBalance for lower power consumption, and a helium seal for lower power, weight, and increased durability and leak protection.
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Seagate X24 Internal HDD Overview

The 20TB Exos X24 7200 rpm SAS III 12 Gb/s 3.5" Internal HDD from Seagate is a high-performance, large-capacity drive designed for data storage. It's suitable for engineering workstations, network servers, mainframes, supercomputers, and other demanding tasks that require 24/7 operation. This 7200 rpm drive utilizes the SAS III 12 Gb/s interface for data transfer rates of up to 285 MB/s. Moreover, as a professional-grade drive, it has an MTBF rating of 2.5 million hours as well as built-in digital sensors to ensure optimal performance, PowerBalance for lower power consumption, and a helium seal for lower power, weight, and increased durability and leak protection.

Maximum Storage Capacity for Highest Rack Space Efficiency
This 20TB drive offers high capacity 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
PowerBalance optimizes watts per terabyte
Maximize total cost of ownership savings through lower power and weight with a helium sealed-drive design
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 a limited 5-year warranty and 2.5 million hour 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
UPC: 763649175149

Seagate X24 Internal HDD Specs

Key Specs
Total Capacity
20 TB
Drive Type
SAS III / 3.5" HDD (7200 rpm)
Read Speed
Maximum: 285 MB/s
Random: 168 IOPS
Write Speed
Maximum: 272 MB/s
Random: 550 IOPS
Total Capacity
20 TB
Drive Type
SAS III / 3.5" HDD (7200 rpm)
Performance
Read Speed
Maximum: 285 MB/s
Random: 168 IOPS
Write Speed
Maximum: 272 MB/s
Random: 550 IOPS
Encryption Support
No
Mean Time Between Failures (MTBF)
2.5 Million Hours
Endurance (Total Bytes Written)
550 TB
Electrical
Power Draw
6.5 W (Idle)
9.8 W (Max)
8.2 W (Active)
Input Power
5 to 12 VDC
General
Operating Conditions
41 to 140°F / 5 to 60°C at 5 to 95% Humidity
Operating Shock
40 G / 2.0 ms
Storage Conditions
-40 to 158°F / -40 to 70°C at 5 to 95% Humidity
Dimensions
5.8 x 4.01 x 1" / 147 x 101.85 x 26.1 mm
Weight
1.51 lb / 0.68 kg
Packaging Info
Package Weight
1.695 lb
Box Dimensions (LxWxH)
6.8 x 5.3 x 2.3"

Seagate X24 Internal HDD Reviews

Supportless Product

By Joseph
Rated 1 out of 5
Date: 2026-03-16

Seagate used to be my go-to for hard drives. Like all other drives, they work great until they don't, but when they don't you are on your own. Seagate does not stand by their products anymore. I have been trying to do an RMA with them for 2 months. I received a bad drive as a replacement, and have been getting the runaround ever since. Be prepared to buy replacement drives even while still within the warranty period.

Massive density that actually stays cool

By Matthew
Rated 5 out of 5
Date: 2026-02-10

We picked up a bunch of these for a huge infrastructure overhaul at our studio. When you're trying to consolidate a massive amount of project data into a smaller footprint, these are pretty much the only way to go. It’s still a bit surreal how much you can fit on a single drive these days—we were able to move archives that used to fill half a rack onto just a handful of these. The standout for me is the temperature. Usually, when you pack a NAS full of high-capacity drives, it starts sounding like a jet engine trying to keep everything from overheating. Because these are helium-filled, they run way cooler than the older, smaller drives we replaced. Even when we were pushing them to the limit during a massive, week-long data sync, they stayed surprisingly chill and never hit those scary heat thresholds. If you’re running a professional setup with ZFS or a high-end RAID, these are exactly what you want. They have the standard enterprise features that prevent the drive from locking up your entire system if it hits a minor read error. We’ve been hammering them with huge 3D scenes and enormous video files for weeks now, and the performance hasn't skipped a beat. They aren't silent—you’re definitely going to hear that classic enterprise "crunch" when they're working hard—but if you're putting them in a rack or a decent workstation, it's totally fine. You're buying these for the massive capacity and the fact that they're built to run 24/7 without giving up on you. Pros: - Huge capacity lets you shrink your physical server footprint. - Helium tech keeps the heat way down compared to older drives. - Built for constant, heavy-duty use in professional arrays. - Solid, predictable performance even when the volumes are nearly full. Cons: - Definitely not silent (to be expected for enterprise gear). - You'll want to make sure your hardware and OS are modern enough to recognize drives this huge.

See any errors on this page?

Will these drives (20 and 24tb) work with my OWC ...

Will these drives (20 and 24tb) work with my OWC Drive Dock?
Asked by: Timothy
The Seagate 24TB Exos X24 7200 rpm SATA III 6 Gb/s 3.5" Internal HDD (OEM) will be compatible with the OWC Drive Dock.
Answered by: Alex D
Date published: 2025-02-09

is this compatible with a Synology RS3618xs?

is this compatible with a Synology RS3618xs?
Asked by: Justin
The Seagate 24TB Exos X24 7200 rpm SAS III 12 Gb/s 3.5" Internal HDD (OEM), B&H # SEST24NM007H, is not listed by Synology as compatible with the RS3618xs.
Answered by: Miguel M
Date published: 2025-02-23

Do the OEM drives come with a full 5-year ...

Do the OEM drives come with a full 5-year warranty?
Asked by: Derek
Yes. The Seagate 12TB Exos X24 7200 rpm SATA III 6 Gb/s 3.5" Internal HDD (OEM), BH #SEST12NM002H, does come with the Limited 5-Year Manufacturer Warranty.
Answered by: Elchanan P
Date published: 2025-12-29
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