Western Digital 0F38462 16TB SATA Ultra SE HDD — main product image

Western Digital 0F38462 16TB SATA Ultra SE HDD

Western Digital

Western Digital 0F38462 16TB SATA Ultra SE HDD

Name: Western Digital 0F38462 16TB SATA Ultra SE HDD
Brand: Western Digital
SKU: 0F38462

★★★★★4.4 (154 reviews)

16TB of SATA enterprise capacity with a 512MB cache buffer engineered to sustain sequential throughput under continuous NAS and data center workloads.

$454.99*

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Western Digital DC HC550 is a 16TB enterprise SATA hard drive using HelioSeal technology — a hermetically sealed, helium-filled enclosure that allows WD to stack more platters in the standard 3.5" form factor while reducing air resistance, vibration, and thermal output compared to conventional air-filled drives at this capacity. The 512MB DRAM cache buffer is a significant hardware allocation by HDD standards, designed to smooth burst write workloads and sequential read operations ahead of platter access. The CMR recording architecture is architecturally important: every track is written independently without shingling, which means RAID parity writes, simultaneous read/write operations, and drive rebuild sequences perform at consistent, predictable speeds. The SATA III interface delivers the compatibility breadth that datacenter and NAS deployments require, though it caps the theoretical maximum sequential throughput at the mechanical platter rather than the bus.

This drive is built for enterprise NAS enclosures, direct-attach storage arrays, and server deployments requiring high-capacity, always-on storage. The 550TB/year workload rating and continuous-duty specification put it in a different operational class than consumer drives, which are typically rated for far lower annual workload demands. For a home lab user running a Plex server or personal backup target, the drive will function correctly but the enterprise ratings exceed actual use conditions — a purpose-built NAS drive will deliver comparable real-world longevity at lower cost. Where the HC550's spec sheet is genuinely load-bearing is in SMB server rooms, surveillance storage arrays, and cloud infrastructure nodes running continuous ingestion workloads that would wear down a consumer-rated drive within its warranty period.

Key Features

0F38462

Specifications

Capacity

16TB

Interface

SATA III (6Gb/s)

Cache

512MB

Form Factor

3.5"

Recording Technology

CMR (Conventional Magnetic Recording)

Enclosure

HelioSeal (hermetic helium-filled)

Model

WD DC HC550 (0F38462)

Intended Use

Enterprise / Data Center / NAS

Pros & Cons

👍 Pros

HelioSeal hermetic helium enclosure enables the platter density required to reach 16TB in a 3.5" form factor while running cooler and quieter than equivalent air-filled drives.
512MB cache buffer is among the largest available on a SATA HDD, meaningfully improving burst sequential performance for large file transfers and backup workloads.
CMR recording technology ensures predictable write behavior during RAID rebuilds and parity operations — no SMR write-penalty risk in multi-drive arrays.
Enterprise-class 24/7 operation rating and high annual workload limit (550TB/year) makes this appropriate for continuous data center and NAS deployments.
SATA III interface provides broad compatibility across server motherboards, HBA cards, and NAS enclosures without requiring SAS infrastructure.

👎 Cons

SATA interface caps practical sequential throughput well below what SAS or NVMe alternatives achieve — this is not the right drive for latency-sensitive database or VM storage applications.
Enterprise pricing reflects datacenter reliability specifications that exceed what a home or small office NAS user will actually exercise — cost-per-TB is higher than consumer NAS drives optimized for the same use case.
Helium-filled HelioSeal design means a compromised seal (from physical damage or seal failure over years) can degrade performance in ways that are not immediately diagnosable.
At 16TB spinning-disk capacity, sustained RAID rebuild times on a full array are measured in hours to days — a significant exposure window for data risk even with enterprise-grade drive reliability.

Frequently Asked Questions

What is the WD DC HC550, and how does it differ from WD's consumer drives?

The DC HC550 is Western Digital's enterprise-class CMR (Conventional Magnetic Recording) hard drive, built for 24/7 operation in demanding environments. Unlike WD's consumer Blue or Red lines, the HC550 is rated for higher annual workload requirements (typically 550TB/year) and uses HelioSeal technology — a hermetically sealed helium-filled enclosure that reduces internal turbulence, enabling higher platter density and lower operating temperatures than air-filled drives.

Will this drive work in a consumer NAS (Synology, QNAP, etc.)?

Physically yes — it uses a standard SATA interface and 3.5" form factor. However, the HC550 is an enterprise-class drive not specifically validated against consumer NAS compatibility lists in the way that WD Red Pro or Seagate IronWolf are. Check your NAS vendor's compatibility matrix before deploying. It will function but may not carry the explicit NAS-vendor support that purpose-branded NAS drives do.

What does the 512MB cache buffer mean for real-world performance?

At 512MB, this is one of the larger cache buffers available in a SATA HDD. It primarily benefits sequential read/write bursts — large file transfers, backup jobs, and streaming workloads will see the cache absorb bursts more effectively before the drive must rely on sustained platter throughput. For random small-file access (typical of OS boot drives), the spinning-disk architecture is still the fundamental constraint, not the cache.

Is CMR recording technology important here?

Yes, particularly for RAID environments. CMR (vs. SMR, Shingled Magnetic Recording) writes data in non-overlapping tracks, which means RAID rebuild operations, parity writes, and simultaneous read/write workloads perform predictably. SMR drives can exhibit significant performance degradation during RAID rebuilds — a risk you don't take on with this CMR-based enterprise drive.

What interface does this drive use and what transfer speeds should I expect?

SATA III (6Gb/s). While the bus supports up to 600MB/s, the mechanical platter is the actual throughput ceiling. Western Digital's enterprise 7200RPM SATA drives in this capacity class typically sustain 200–270MB/s sequential read, which is the expected operating range for the HC550.