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Silver 3.5 inch bare hard drive with circuit board visible

Western Digital

Western Digital 0F38459 Ultrastar DC HC550 18TB 3.5" 7200 RPM 512MB cache SATA internal hard drive

SKU CH-VQND-QKGNH MPN 0F38459

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 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.

Privalumai

  • 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

Specifikacijos

BrandWD
SeriesUltrastar DC HC550
ModelWUH721818ALE6L4 (0F38459)
PackagingBare Drive
InterfaceSATA 6.0Gb/s
Capacity18TB
Recording TechnologyCMR
RPM7200 RPM
Cache512MB
Average Latency4.16ms
FeaturesUp 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
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.60mm
Length (maximum)147.00mm
Siuntos svoris0.91 kg
Pakuotės dydis152 × 102 × 25 mm

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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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