Product Description
Recertified Seagate Exos X18 14TB 3.5" SATA HDD – 7,200 RPM, 6Gb/s, 256MB Cache, ST14000NM000J
Enterprise-class capacity and performance at a recertified price — the Seagate Exos X18 14TB is a 7,200 RPM 3.5" SATA hard drive built for hyperscale data centres, high-density NAS systems, and demanding storage workloads. With a 256MB cache, sustained transfer rates up to 270 MB/s, and a 2.5 million hour MTBF rating, the Exos X18 is engineered for continuous operation at scale. This unit has been professionally recertified and is covered by a 1-year PCBoost warranty.
Enterprise-Grade Performance in a Recertified Drive
The Seagate Exos X18 is one of Seagate's highest-performing 3.5" SATA hard drives, engineered for 24/7 operation in enterprise NAS enclosures, server storage arrays, and hyperscale data centres. The 14TB capacity, combined with sustained transfer rates up to 270 MB/s and a 7,200 RPM spindle speed, makes it well suited for high-throughput workloads that consumer-grade drives cannot reliably sustain. Furthermore, the recertified format allows access to this enterprise performance tier at a significantly lower cost than a new unit.
The Exos X18 achieves 14TB per 3.5" drive using Seagate's advanced areal density technology, making it one of the most capacity-efficient SATA drives available. This density is particularly valuable in multi-bay NAS enclosures and server racks where physical space is limited. Moreover, the SATA 6Gb/s interface ensures broad compatibility with virtually all NAS devices, servers, and direct-attached storage solutions currently in use.
The Exos X18 delivers sustained sequential data transfer rates up to 270 MB/s — significantly higher than consumer-grade NAS drives typically manage in real-world conditions. This performance makes the drive suitable for large sequential read and write workloads such as video surveillance storage, media archiving, and bulk data migration. Furthermore, the 256MB multi-tier cache supports both read-intensive and write-intensive usage patterns efficiently.
The Exos X18 carries a 2.5 million hour mean time between failures (MTBF) rating — the benchmark for enterprise-class storage reliability. It is rated for up to 550TB of workload per year, compared to the 55–180TB annual workload ratings typical of consumer and prosumer NAS drives. Therefore, the Exos X18 is suited to environments where drives are under sustained read/write pressure around the clock rather than lighter home or small office use cases.
The Exos X18 features Seagate's PowerChoice and PowerBalance technology for optimised power management, alongside enhanced rotational vibration (RV) sensors that compensate for vibration in multi-drive enclosures. Additionally, the drive incorporates Seagate's RAID-specific error recovery control (ERC/TLER), ensuring that RAID controllers do not prematurely drop the drive during an extended error recovery operation — a common failure point with consumer drives used in RAID arrays.
The Exos X18 uses a hermetically sealed, helium-filled enclosure to achieve its 14TB capacity. Helium is less dense than air, which reduces internal turbulence and allows Seagate to stack more platters within the same 3.5" form factor. This design also contributes to lower operating temperatures and reduced power consumption compared to air-filled drives of equivalent capacity — an important consideration in high-density rack deployments.
The ST14000NM000J ships in 512E (512-byte emulation) format, which provides broad compatibility with legacy systems and operating systems while maintaining compatibility with modern 4K-native (4Kn) infrastructure. Seagate's FastFormat feature additionally allows the drive to be reformatted to 4Kn sector size in the field without data loss when native 4K support is required by the target system or controller.
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 before resale. They provide a cost-effective route to enterprise-class storage capacity and reliability.
There are important differences to understand before purchasing a recertified drive. Please read the following carefully.
Professionally Tested
Each unit is inspected and tested to confirm operational performance before despatch
1-Year PCBoost Warranty
Covered by a 1-year PCBoost warranty only. No manufacturer warranty applies to recertified units
Cosmetic Marks Possible
Recertified units may show minor cosmetic wear. Functional performance is verified prior to sale
Enterprise Value
Access enterprise-class capacity and reliability at a substantially lower cost than new
NAS and Server Compatibility
The Exos X18 14TB is compatible with a wide range of NAS enclosures, server platforms, and direct-attached storage systems that accept 3.5" SATA drives. Always verify your NAS vendor's compatibility list before installation, as some enclosures may require a firmware update to recognise drives above a specific capacity threshold.
Technical Specifications
| Feature | Specification |
|---|---|
| Model Number | ST14000NM000J |
| Product Series | Seagate Exos X18 |
| Condition | Recertified – 1-year PCBoost warranty |
| Capacity | 14TB |
| Interface | SATA 6Gb/s |
| Form Factor | 3.5 inch |
| Rotational Speed | 7,200 RPM |
| Sustained Transfer Rate | Up to 270 MB/s |
| Cache (Multi-Tier) | 256MB |
| Sector Size | 512E / 4Kn (FastFormat) |
| Drive Fill | Helium sealed |
| MTBF | 2,500,000 hours |
| Annual Workload Rating | 550TB per year |
| Load / Unload Cycles | 600,000 |
| Idle Power (typical) | Approx. 5.0W (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. 650g |
| Rotational Vibration Sensor | Yes |
| RAID Error Recovery (ERC/TLER) | Yes |
| Warranty | 1-year PCBoost warranty (recertified unit) |
Ideal Applications for the Exos X18 14TB
High-Density NAS Storage Arrays
The 14TB capacity and 550TB annual workload rating make the Exos X18 a natural fit for multi-bay NAS enclosures operating as primary storage in small businesses, media studios, or home labs with heavy workloads. At 14TB per drive, a 4-bay NAS populated with Exos X18 units delivers up to 56TB raw in a single enclosure. Moreover, the integrated RV sensors maintain read/write stability even in enclosures with multiple drives spinning simultaneously.
Video Surveillance and Security Storage
Continuous write workloads from multi-camera surveillance systems are among the most demanding use cases for any hard drive. The Exos X18's 550TB annual workload rating and 2.5 million hour MTBF ensure it handles these workloads reliably. Furthermore, 14TB of capacity provides extended retention at high bitrates — a key consideration for professional security installations.
Media Archiving and Content Libraries
For creative studios and media professionals building long-term archives of raw footage, completed productions, or photography libraries, the Exos X18 provides exceptional capacity per drive. The sustained 270 MB/s transfer rate additionally makes ingest and retrieval of large media files significantly faster than slower-spinning drives, reducing the time spent waiting during file management tasks.
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PC component warranty periods vary widely by product, model and brand. Please refer to the specific listing description above for the exact warranty period of this product. PC components typically range from 1 year to lifetime warranty.
Typical Warranty Periods (PC Parts & Computers)
| Product Category | Typical Warranty |
|---|---|
| Graphics Cards (GPUs) | 2-3 Year Manufacturer Warranty |
| Processors (CPUs) | 3 Year Manufacturer Warranty |
| Motherboards | 3 Year Manufacturer Warranty |
| Memory (RAM) | Lifetime Limited Warranty |
| Power Supplies (PSUs) | 5-10 Year Manufacturer Warranty |
| SSDs (Internal & External) | 3-5 Year Manufacturer Warranty |
| External HDDs | 2-3 Year Manufacturer Warranty |
| CPU Coolers (Air & Liquid) | 2-6 Year Manufacturer Warranty |
| PC Cases | 1-2 Year Manufacturer Warranty |
| Laptops & Notebooks | 1-2 Year Manufacturer Warranty |
| Mini PCs | 1-3 Year Manufacturer Warranty |
| Custom Built PCs | 1 Year PCBoost Warranty |
High-end components (ASUS ROG, Corsair Premium, be quiet! Dark Power) may include extended warranties up to 10 years. Always check the listing for the exact warranty period.
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- Wear and tear or normal degradation over time
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