Product Description
Recertified Seagate Exos X24 24TB 3.5" SATA HDD – 7,200 RPM, 6Gb/s, 512MB Cache, ST24000NM000C
Seagate's highest-capacity SATA hard drive in a recertified format — the Exos X24 24TB delivers flagship enterprise storage density with sustained transfer rates up to 285 MB/s, a 512MB multi-tier cache, 2.5 million hour MTBF, and a 550TB annual workload rating. Purpose-built for hyperscale deployments, high-density NAS arrays, and demanding 24/7 data centre workloads, the Exos X24 is the benchmark for maximum SATA capacity per drive bay. This unit has been professionally recertified and is covered by a 1-year PCBoost warranty.
The Highest-Capacity SATA Drive in the Exos Family
The Exos X24 sits at the top of Seagate's enterprise SATA line-up. At 24TB per 3.5" drive, it maximises raw capacity per drive bay — delivering substantially more storage per rack unit than lower-capacity alternatives while maintaining the enterprise-grade reliability and workload ratings that define the Exos series. For deployments where capacity density is the primary constraint, the X24 is the definitive SATA choice.
Enterprise X24 – What Sets It Apart
The Exos X24 is not simply an incremental capacity upgrade over earlier Exos models — it introduces a doubled 512MB multi-tier cache, higher sustained transfer rates, and advanced helium-sealed platter technology to achieve 24TB in the standard 3.5" form factor. Together these advances make the X24 the most capable SATA enterprise drive Seagate has produced, at a capacity that was only recently achievable in significantly more expensive SAS and nearline configurations.
The Exos X24 achieves 24TB in a standard 3.5" SATA form factor using advanced perpendicular magnetic recording and a hermetically sealed helium-filled enclosure. This capacity level enables storage architects to maximise usable storage per rack unit without migrating to SAS infrastructure. In a 4-bay NAS, four X24 drives deliver 96TB raw — a figure previously requiring substantially more hardware. Furthermore, the SATA 6Gb/s interface ensures compatibility with existing NAS and server infrastructure without controller upgrades.
The Exos X24 features a 512MB multi-tier cache — double the 256MB cache found in the Exos X18 series. This expanded cache directly benefits mixed read/write workloads, allowing the drive to absorb larger write bursts and serve read requests from cache more frequently before committing to platter access. The result is improved practical throughput in real-world workloads — particularly NAS file serving, backup operations, and database storage — where access patterns are rarely purely sequential.
The Exos X24 delivers sustained sequential transfer rates up to 285 MB/s — the highest in the Exos SATA line-up and meaningfully ahead of older enterprise SATA drives. This performance is particularly valuable for large sequential workloads such as media ingest, bulk backup operations, data migration, and large-file archiving. Additionally, the higher areal density of the X24's platters contributes to this improved throughput compared to earlier-generation drives at lower capacities.
The X24 uses a hermetically sealed helium-filled enclosure to achieve its 24TB capacity. Helium's lower density reduces internal air resistance and platter turbulence, enabling Seagate to stack more platters within the 3.5" height envelope. Beyond enabling greater capacity, this also lowers operating temperatures and reduces power consumption compared to air-filled drives at equivalent platter counts — an important operational consideration in high-density rack deployments where aggregate heat load and power draw directly affect infrastructure costs.
The Exos X24 carries the same 2.5 million hour MTBF and 550TB annual workload rating as the broader Exos enterprise family. This means the drive is validated to sustain ten times the annual read/write volume of a typical NAS-grade drive without accelerated wear. For deployments running 24/7 backup targets, media archives, or object storage nodes, this workload ceiling provides genuine confidence that the drive will operate reliably throughout its intended service life rather than degrading prematurely under sustained pressure.
The Exos X24 includes RAID Error Recovery Control (ERC/TLER) to prevent RAID controllers from incorrectly ejecting the drive during error recovery — a frequent failure mode when consumer drives are used in RAID arrays. Integrated rotational vibration (RV) sensors additionally compensate for the mechanical vibration generated by adjacent drives in multi-bay enclosures, maintaining read/write accuracy at all drive population levels. Together these features make the X24 a reliable building block for RAID 5, RAID 6, and RAID 10 configurations at any scale.
What Does Recertified Mean?
Recertified drives are professionally inspected and tested units that have been returned, refurbished to a working standard, and verified for performance and operational integrity before resale. They provide a cost-effective route to the highest tier of enterprise SATA storage capacity.
There are important differences to understand before purchasing a recertified drive. Please read the following carefully.
Professionally Tested
Each unit is inspected and verified to meet operational performance standards before despatch
1-Year PCBoost Warranty
Covered by a 1-year PCBoost warranty only. No manufacturer warranty applies to recertified units
Cosmetic Marks Possible
Minor cosmetic wear may be present. All functional performance is verified prior to despatch
Flagship Value
Access the highest-capacity SATA enterprise drive at a substantially lower cost than new
NAS and Server Compatibility
The Exos X24 24TB uses the standard 3.5" SATA 6Gb/s interface, ensuring broad compatibility across NAS enclosures, server platforms, and JBOD / direct-attached storage systems. Always verify your NAS vendor's compatibility list before installation, as some enclosures may require a firmware update to recognise drives above a given capacity threshold. Given the X24's 24TB capacity, this verification step is particularly important for older enclosures.
Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | ST24000NM000C |
| Product Series | Seagate Exos X24 |
| Condition | Recertified – 1-year PCBoost warranty |
| Capacity | 24TB |
| Interface | SATA 6Gb/s |
| Form Factor | 3.5 inch |
| Rotational Speed | 7,200 RPM |
| Sustained Transfer Rate | Up to 285 MB/s |
| Cache (Multi-Tier) | 512MB |
| Sector Size | 512E / 4Kn (FastFormat) |
| Drive Fill | Helium sealed |
| Recording Technology | CMR (Conventional Magnetic Recording) |
| MTBF | 2,500,000 hours |
| Annual Workload Rating | 550TB per year |
| Load / Unload Cycles | 600,000 |
| Active Power (typical) | Approx. 9.0W |
| Idle Power (typical) | Approx. 5.5W (idle A) |
| Operating Temperature | 5°C to 60°C |
| Dimensions (W x H x D) | 101.6 x 26.1 x 147.0 mm |
| Weight | Approx. 720g |
| Rotational Vibration Sensor | Yes |
| RAID Error Recovery (ERC/TLER) | Yes |
| Warranty | 1-year PCBoost warranty (recertified unit) |
Ideal Applications for the Exos X24 24TB
Maximum-Density NAS Storage Builds
The X24 is the most efficient way to maximise raw capacity in a fixed number of drive bays. A 6-bay NAS populated with six Exos X24 drives delivers 144TB raw — with a RAID 6 configuration yielding approximately 96TB of usable, double-fault-tolerant storage. Moreover, the 512MB cache and 285 MB/s transfer rate ensure the array performs as a fast working storage system rather than a slow archive, making it viable as both primary storage and long-term archive in the same enclosure.
Hyperscale and Data Centre Deployments
For data centres and cloud infrastructure providers building petabyte-scale storage on a per-rack basis, the X24's 24TB-per-drive density directly reduces the number of drives, HBAs, and bays required to reach a target storage capacity — lowering both capital expenditure and ongoing power and cooling costs. Furthermore, the 550TB annual workload rating ensures the drives sustain the continuous read/write pressure common in object storage and backup-as-a-service environments without premature degradation.
Large-Scale Media and Content Archives
Post-production studios, broadcast facilities, and digital asset management teams dealing in multi-terabyte project files and extensive archive libraries benefit directly from the X24's capacity density. At 24TB per drive, a relatively small multi-bay enclosure holds a content library that would require significantly more drives using earlier-generation storage. Additionally, the 285 MB/s sustained throughput makes retrieval and ingest of large media assets meaningfully faster than lower-performing archive solutions.
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|---|---|
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