Western Digital
Western Digital Ultrastar DC HC550 16TB 3.5" 7200 RPM 512MB SATA 0F38462
- SATA 6.0Gb/s
- 16TB
$232.99
0.00295992BTC
In stock
Western Digital
Western Digital 0F38459 Ultrastar DC HC550 18TB 3.5" 7200 RPM 512MB cache SATA internal hard drive
An 18TB 3.5-inch SATA drive with 7200 RPM, 512MB cache, CMR recording and helium sealing for enterprise storage
- PackagingBare Drive
- InterfaceSATA 6.0Gb/s
- Capacity18TB
- Recording TechnologyCMR
- RPM7200 RPM
- Cache512MB
Options 18TB
- 18TB
- 16TB
- 18TB capacity fits in a standard 3.5-inch bay
- 7200 RPM spindle speed enables fast sequential access
- 512MB cache buffers bursts for smoother throughput
- Energy-Assisted Magnetic Recording boosts areal density without extra platters
- Triple Stage Actuator improves head positioning accuracy
High-capacity enterprise hard drive
The Western Digital Ultrastar DC HC550 0F38459 is an 18TB 3.5-inch internal hard drive built for enterprise storage systems. It spins at 7200 RPM with a 512MB cache and connects via SATA 6.0Gb/s. The drive uses CMR recording technology and incorporates Energy-Assisted Magnetic Recording with a Triple Stage Actuator for reliable high-density performance.
Suited for bulk storage arrays.
This drive suits administrators deploying large-capacity RAID arrays, backup repositories or nearline storage where sequential throughput and cost per terabyte matter. The HelioSeal design delivers power efficiency for dense deployments. Buyers needing low-latency random access for transactional databases or virtualisation hosts should look at solid-state alternatives instead.
SATA 6.0Gb/s interface determines host compatibility
The single specification that decides fitment is the SATA 6.0Gb/s interface; the system backplane or controller must support this standard. The bare-drive packaging means no mounting brackets or cables are included, so installation hardware must be sourced separately. A projected 2.5M hour MTBF rating reflects the drive's enterprise-grade design targets.
Highlights
- 18TB capacity fits in a standard 3.5-inch bay
- 7200 RPM spindle speed enables fast sequential access
- 512MB cache buffers bursts for smoother throughput
- Energy-Assisted Magnetic Recording boosts areal density without extra platters
- Triple Stage Actuator improves head positioning accuracy
Specifications
| Brand | WD |
|---|---|
| Series | Ultrastar DC HC550 |
| Model | WUH721818ALE6L4 (0F38459) |
| Packaging | Bare Drive |
| Interface | SATA 6.0Gb/s |
| Capacity | 18TB |
| Recording Technology | CMR |
| RPM | 7200 RPM |
| Cache | 512MB |
| Average Latency | 4.16ms |
| Features | Up to 18TB capacity in a standard 3.5-inch form factor Industry's first Energy-Assisted Magnetic Recording technology Industry's first Triple Stage Actuator Leading HelioSeal technology Reliable, field-proven design across five generations HelioSeal design delivers power efficiency (Watts/TB) 2.5M hours MTBF rating |
| Usage | For Enterprise Storage |
| Form Factor | 3.5" |
| Height (maximum) | 26.10mm |
| Width (maximum) | 101.60mm |
| Length (maximum) | 147.00mm |
| Shipping weight | 0.91 kg |
| Package size | 152 × 102 × 25 mm |
Other versions of this model
1 more in the same range
Same family, different memory, cooler or clock — compare before you commit.
Questions about this item
How much power does the 18TB 7200 RPM drive draw during all-day operation?
The HelioSeal design delivers outstanding power efficiency measured in Watts per TB, keeping heat and noise low for continuous enterprise workloads.
What host interface and physical bay does the 3.5-inch SATA 6.0Gb/s drive need to work?
A standard 3.5-inch drive bay and a SATA 6.0Gb/s port with matching data and power cables are required for installation.
Will the 512MB cache CMR drive work reliably alongside older SATA drives in the same array?
CMR technology works with all capacity enterprise applications and environments, so it integrates with existing SATA storage without changes.
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