Seagate
Seagate Cheetah NS ST3400755SSProduct 400 GB 3.5" SAS internal hard drive
- SLC
$23.99
0.00030554BTC
In stock
Western Digital
Western Digital WD181KFGXProduct Red Pro 18TB 7200 RPM 3.5" SATA internal hard drive
An 18 TB 3.5-inch SATA hard drive spinning at 7200 RPM with a 512 MB cache and CMR technology, built for NAS systems with up to 24 bays
- Capacity18TB
- RPM7200 RPM
- InterfaceSATA 6.0Gb/s
- Cache512MB
- Recording TechnologyCMR
- Form Factor3.5"
- 18 TB capacity for large NAS storage
- 7200 RPM speed for fast data access
- CMR technology for consistent write performance
- Helium-sealed design with vibration sensors for 24-bay reliability
- 512 MB cache with SATA 6.0 Gb/s interface
18 TB Red Pro NAS Drive
The Western Digital Red Pro WD181KFGX is an 18 TB 3.5-inch internal hard drive built for network-attached storage. It spins at 7200 RPM over a SATA 6.0 Gb/s interface and uses conventional magnetic recording with a 512 MB cache. A helium-sealed design and rotational vibration sensors support reliable operation in multi-bay enclosures.
Suited for 24-bay NAS workloads
This drive targets power users and medium-sized businesses running 24x7 NAS systems with up to 24 bays. It handles high-intensity workloads such as archiving, file sharing and backup for many concurrent users. Buyers who need a smaller capacity or a lower-RPM drive for lighter desktop use should consider other models.
CMR recording with helium sealing
The single specification that decides fit is the conventional magnetic recording method combined with a helium-sealed chassis. CMR delivers consistent write performance without the latency penalties of shingled recording, while the helium fill reduces turbulence and power draw at 7200 RPM. This combination makes the drive appropriate for heavy, always-on NAS arrays.
Highlights
- 18 TB capacity for large NAS storage
- 7200 RPM speed for fast data access
- CMR technology for consistent write performance
- Helium-sealed design with vibration sensors for 24-bay reliability
- 512 MB cache with SATA 6.0 Gb/s interface
Specifications
| Brand | Western Digital |
|---|---|
| Series | Red Pro |
| Model | WD181KFGX |
| Part Number | WD181KFGX |
| Capacity | 18TB |
| RPM | 7200 RPM |
| Interface | SATA 6.0Gb/s |
| Cache | 512MB |
| Recording Technology | CMR |
| Form Factor | 3.5" |
| Features | Helium-Sealed Design, Rotational Vibration Sensors, Multi-Axis Shock Sensor, Native Command Queuing |
Questions about this item
What does the 18TB capacity mean for a NAS with many users?
The 18TB capacity lets a multi-bay NAS store very large shared libraries, backups and archives so many users can access data without running out of space.
What does the SATA 6.0Gb/s interface limit in practice?
The SATA 6.0Gb/s link sets the maximum data rate between the drive and the NAS controller, so sustained transfers cannot exceed the interface bandwidth.
Will this 3.5-inch drive fit a standard NAS tray?
The 3.5-inch form factor matches standard NAS drive trays and desktop bays, so it mounts directly without adapters.
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