Seagate
Seagate ST18000NM000D Exos X20 18TB 7200 RPM 256MB SAS 12Gb/s 3.5 internal hard drive
Enterprise 18 TB SAS drive with 7200 RPM, 256 MB cache and CMR recording for high-capacity storage arrays
- InterfaceSAS 12Gb/s
- Capacity18TB
- Recording TechnologyCMR
- RPM7200 RPM
- Cache256MB
- Average Latency4.16ms
- 18TB capacity stores massive datasets in a single 3.5" drive
- 7200 RPM and 256MB cache deliver high throughput for enterprise workloads
- SAS 12Gb/s interface enables fast, reliable data transfers
- CMR recording technology ensures consistent write performance
- Helium-sealed design reduces power per terabyte and weight
Enterprise Capacity Drive
The Seagate Exos X20 ST18000NM000D is an 18TB 3.5-inch internal hard drive built for enterprise storage arrays. It runs at 7200 RPM with a 256MB cache and uses conventional magnetic recording technology. The SAS 12Gb/s interface supports high-throughput workloads in rack-mounted systems.
Suited For High-Density Racks
This drive targets cloud data centres and massive scale-out deployments that need maximum petabytes per rack. Its helium-sealed design and PowerBalance feature optimise watts per terabyte for lower operating costs. Buyers who need a SATA interface or a non-enterprise drive for desktop or small-business NAS should look at other models.
Deciding Specification SAS 12Gb/s
The single specification that decides fit is the SAS 12Gb/s interface, which requires a compatible controller or backplane. Without SAS infrastructure the drive cannot be used, so verify your host bus adapter and enclosure support before purchase.
Highlights
- 18TB capacity stores massive datasets in a single 3.5" drive
- 7200 RPM and 256MB cache deliver high throughput for enterprise workloads
- SAS 12Gb/s interface enables fast, reliable data transfers
- CMR recording technology ensures consistent write performance
- Helium-sealed design reduces power per terabyte and weight
Specifications
| Brand | Seagate |
|---|---|
| Series | Exos X20 |
| Model | ST18000NM000D |
| Interface | SAS 12Gb/s |
| Capacity | 18TB |
| Recording Technology | CMR |
| RPM | 7200 RPM |
| Cache | 256MB |
| Average Latency | 4.16ms |
| Features | Market-leading 20TB HDD offering the highest capacity available 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 Hyperscale SATA model tuned for large data transfers and low latency PowerBalance feature optimizes Watts/TB Maximize total cost of ownership savings through lower power and weight with helium sealed-drive design Proven helium side-sealing weld technology for added handling robustness and leak protection Digital environmental sensors to monitor i |
| Usage | For Enterprise Storage |
| Form Factor | 3.5" |
| Height (maximum) | 26.10mm |
| Width (maximum) | 101.85mm |
| Length (maximum) | 147.00mm |
| Shipping weight | 0.91 kg |
| Package size | 196 × 152 × 76 mm |
Questions about this item
What does the SAS 12Gb/s interface cap in practice?
The SAS 12Gb/s interface caps the theoretical maximum transfer rate at 12 gigabits per second, with actual sustained throughput limited by the 7200 RPM mechanics and 256MB cache.
What physical space and mounting does the 3.5-inch form factor need?
The drive measures 147.00mm long, 101.85mm wide and 26.10mm high, fitting a standard 3.5-inch drive bay with bottom and side mounting points.
How is the drive installed and which step is often missed?
Connect the SAS data and power cables, secure the drive with four screws in the chassis bay, then configure the drive in the RAID controller or HBA BIOS so the operating system can see the 18TB volume.
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